ARIANT Changelog

ARIANT 1.8.2.3

Release Date: 2023-09-26
Changes Include:
  • A delayed neutron precursor transport (DNP) model has been implemented to support molten salt reactors with liquid fuel under the ‘KINETICS’ System model. This code version will enable code users to immediately start modeling this type of SMRs using liquid fuel that circulate within the piping network. The model implementation allows for users to model no DNP production outside the core, or optionally solve a 1D transport equation to calculate a source term for the liquid fuel in the network.
  • User option ‘GRAVITY(nval)’ is now available under the ‘NUMERIC OPTIONS’ to simulate networks under a reduced gravity environment (e.g. for space applications) through a user-defined acceleration due to gravity.
  • Additional, updated critical heat flux correlations 'TABLE LOOK-UP' option with six of the most recent lookup tables (LUT) are now available for use. These include CHF LUT for tubes as well as 37-element CANDU fuel bundles. ARIANT uses CHF temperature (TCHF) to determine the boundary between nucleate and transition boiling regimes. The search for TCHF can potentially take significant processing time. In this code version ‘TCHF-LUT’ option has been implemented and has been observed to be considerably faster than the current methods (analytical or iterative) in the code.
  • A heat exchanger system model has been developed and is now available for use. This model enables the users to model heat exchangers with ease through an ARIANT system model where the user can also use ARIANT system control models to manipulate the parameters of the heat exchanger. More complex heat exchangers can still be modeled through the use of ARIANT wall models.
  • Various bug fixes that may affect separators with junction resistance models.
  • Please note that there are two executables corresponding to this release:
    • ARIANT-1.8.2.3.exe – compiler switches set for full debug, no optimization, etc.;
    • ARIANT-1.8.2.3-opt.exe – compiled with all debug switches off and optimization switches set to favor speed; will execute faster (with minimal error traceback info).

ARIANT 1.8.2.1

Release Date: 2023-08-31
Changes Include:
  • Addressed ARIANT problem report (PR-ARIANT-1.6.2.6-01) on break discharge
    Allowed negative quality; forcing use of single phase liquid discharge coefficient
    Lower limit of smoothing of critical flow discharge coefficient is changed to 0.005, consistent with ARIANT theory manual
    Allowed negative values of relative critical pressure ratio when break pressure is greater than upstream pressure
  • Addressed ARIANT problem report (PR-ARIANT-1.5.2.1-02) on flow regime
    Restricted application of countercurrent flooding limit to circular pipes only
    Revised transition to dispersed droplet or annular-mist flow as a result of droplet entrainment. ARIANT, as of version 1.8.2.1, uses different coefficients for cocurrent and countercurrent flows.
  • Additional link-averaged flow regime variables introduced
    • Added definitions of link--average hydraulic diameter for bubbly-slug and droplet flow regimes
    • Added definitions of link--average interfacial are for droplet and bubbly-turbulent flow regimes
    • Added definitions of link--average hydraulic diameter for bubbly-slug and droplet flow regimes
    • Added definitions of link--average dispersed bubble regime weighting factor
    • Added definitions of link--average slug regime weighting factor
    • Added definitions of link--average dispersed droplet weighting factor
  • Addressed an emergent issue (as of 1.8.1.1 version) when accessing velocities by distance instead of link number – now fixed.
  • Increased implicitness in upstream break pressure by including derivatives of saturation pressure with respect to gas and liquid enthalpy. This results in smoother response when ‘-ORIF’ option is used in the break discharge model.
  • Added back defaults to time step controller parameters. They have been removed from the previous code version (1.8.1.1), resulting in some cases to take unreasonable amount of time to complete.
  • Please note that there are two executables corresponding to this release:
    • ARIANT-1.8.2.1.exe – compiler switches set for full debug, no optimization, etc.; will be slower in execution.
    • ARIANT-1.8.2.1-opt.exe – compiled with all debug switches off and optimization switches set to favor speed; will execute faster (with minimal error traceback info).

ARIANT 1.8.1.1

Release Date: 2023-07-14
Changes Include:
  • Variable node size: The user is now able to specify variable node size for a given pipe component. This requires a second input line in the specification of the pipe component. An example is provided below illustrating use of uniform and variable node size in a pipe component.
    • Uniform node size:
      'HSECT',2.0,2.0,3.141593E-04,0.02,45.0e-6,2.5,'CIRC',10,'H2O'/ number of nodes is set to 10 equal divisions
    • Non-uniform node size:
      'HSECT',2.0,2.0,3.141593E-04,0.02,45.0e-6,2.5,'CIRC',,'H2O'/ note that user has defaulted number of nodes
      0.2,0.3,1.0,0.5/ This additional entry is required to define the node size distribution. This pipe has 4 variable size nodes.
  • Note: An error message will be issued (and the simulation will terminate) if the variable node sizes do not sum to pipe length within 1.0d-04 m.
  • Pipe elevation consistency check: This check ensures that component-ends connecting are at the same elevation, therefore, ensuring there are no elevation gaps when two components are connected. Such gaps in elevation (if not corrected), result in the undesired effect of additional gravity head potentially leading to errors in computed flow rates.
    Note-1: As of the present code version, elevation errors (for closed loops) in excess of 1.0d-04 m will lead to the termination of the simulation.
    Note-2: Elevation of all components and connections are echoed in the *.lis file to help the user identify the cause of the elevation error
    Note-3: Permitted elevation error can be changed by the user through the numeric option 'ELEV-CHECK(error)' where error must be specified in micrometers.
  • Adjacent Node Volume ratio check: Potential instabilities (in rare instances) may occur when two adjacent nodes differ in volume significantly. To alert the user to such situations, the code performs a volume ratio check and reports on volume ratios exceeding a value of 50. Components affected are echoed in the *.lis file and a warning message is also printed at the end of the same file.
    Note: Default ratio threshold can be changed by the user through the numeric option 'VOLRAT-CHECK(NVAL)' (default NVAL=50).
  • Please note that there are two executables corresponding to this release:
    • ARIANT-1.8.1.1.exe – compiler switches set for full debug, no optimization, etc.; will be slower in execution
    • ARIANT-1.8.1.1-opt.exe – compiled with all debug switches off and optimization switches set to favor speed; will execute faster (with minimal error traceback info)

ARIANT 1.7.2.2

Release Date: 2023-05-25
Changes Include:
  • Separator Model: This is an extension of the existing Separator System Model. The first version of the Separator System Model is used to model phase separation at a connection of two pipe components (such as that in the secondary side of a steam generator). The present model extension captures flow regime and connection height dependent phase separation effects. A typical application is the phase separation phenomena observed at header-feeder connections. The model allows for vapor pull-through as well as liquid entrainment effects through Froude Number dependent relations.
  • The user input manual will be updated in the next revision to include the above model. Please contact N. Aydemir if the model is to be used prior to the release of the updated Input Manual; we will provide input guidance.
  • Addressed application point initialization issue when an environment boundary condition is specified in a wall model.
  • Please note that there are two executables corresponding to this release:
    • ARIANT-1.7.2.2.exe – compiler switches set for full debug, no optimization, etc. ; will be slower in execution
    • ARIANT-1.7.2.2-opt.exe – compiled with all debug switches off and optimization switches set to favor speed; will execute faster (with minimal error traceback info)

ARIANT 1.7.1.1

Release Date: 2023-03-22
Changes Include:
    Problem reports (PRs) addressed (detailed description and resolution of these PRs are logged on the ARIANT website):
  • PR-ariant-1.0.0.1.30.exe-05: Addressed wall heat transfer output issue.
  • PR-ariant-1.0.0.1.30.exe-13: Revised maximum inner iteration count in search for TCHF. This avoided excessive computational inefficiency when the root was imaginary.
  • PR-ariant-1.0.0.1.30.exe-08: Resolved as user input issue.
  • PR-ariant-1.0.0.1.30.exe-09: Extended heat wall models to accept multiple controllable variables.
  • PR-ariant-1.0.0.1.30.exe-14: Addressed (activated) uncertainty calculations for single and two-phase pump head.
  • PR-ariant-1.5.6.1-02: Resolved (user did not update their input to conform to new input syntax)
  • PR-ariant-1.6.5.2-03: Dynamic output option (resolved as user input issue, the capability is implemented already).
    Other Changes:
  • Ensure compatibility with CATHENA: When Dittus-Boelter heat transfer correlation is used, it is not also used for nucleate boiling
  • Revised implicit part of wall-to-fluid (bulk) and wall-to-interface heat addition. This resulted in significant gains in computation time for cases with wall models
  • Revised specification of search for TCHF; Removed ‘USE-TCHF’ and ‘ITER-TCHF’ options and replaced by:
    ‘TCHF-ANALYTIC’ turn on TCHF calculation and use analytical method to solve it
    ‘TCHF-ITER’ turn on TCHF calculation and use iterative method to solve it
    The user input manual will be updated to capture the above change. These numeric options are “OFF” by default. Turning ‘TCHF-ITER’ on is equivalent to CATHENA implementation of TCHF calculation. Current ARIANT default is based on calculation of TCHF from heat flux.
  • Please note that there are two executables corresponding to this release:
    • ARIANT-1.7.1.1.exe – compiler switches set for full debug, no optimization, etc. ; will be slower in execution
    • ARIANT-1.7.1.1-opt.exe – compiled with all debug switches off and optimization switches set to favor speed; will execute faster (with minimal error traceback info)

ARIANT 1.6.5.1

Release Date: 2023-01-30
Changes Include:
  • Problem reports (PRs) addressed (detailed description and resolution of these PRs are logged on the ARIANT website):
  • PR-ariant-1.0.0.1.28b.exe-05: Change was made to ensure when 'Dittus-Boelter' correlation was specified for liquid convection by the user, it will also applied in nucleate boiling, resulting in similar void generation rates as in CATHENA.
  • PR-ariant-1.6.2.1-02: Added a new and improved correlation to support wall-to-fluid heat transfer in the presence of noncondensables. A new heat transfer coefficient (‘GNIELINSKI’) for the gas phase has been implemented.
  • PR-ariant-1.6.4.3-01: Resolved issue with access to signal at location (in meters) for gas and liquid velocities when a branch contains only one internal link.
  • PR-ariant-1.6.4.3-opt-01: Address issue with valve flow control when molten salt is present in the circuit.
  • Please note that there are two executables corresponding to this release:
    • ARIANT-1.6.5.1.exe – compiler switches set for full debug, no optimization, etc. ; will be slower in execution
    • ARIANT-1.6.5.1-opt.exe – compiled with all debug switches off and optimization switches set to favor speed; will execute faster (with minimal error traceback info)

ARIANT 1.6.4.3

Release Date: 2022-12-16
Changes Include:
  • Problem reports (PRs) addressed (detailed description and resolution of these PRs are logged on the ARIANT website):
    • PR-ariant-1.0.0.1.29.exe-02
    • PR-ariant-1.0.0.1.30.exe-02
    • PR-ariant-1.0.0.1.30.exe-03
    • PR-ariant-1.0.0.1.30.exe-13
    • PR-ariant-1.1.2.1.exe-02
    • PR-ariant-1.5.6.1.exe-03
    • PR-ariant-1.6.2.1.exe-01
    • PR-ariant-1.6.2.1.exe-03
  • Added numeric option 'NO-DT-LOG’ to minimize size of log file for long simulations. Note that when this option is on, time step control and REDO strategy are not printed in the log file.
  • Please note that there are two executables corresponding to this release:
    • ARIANT-1.6.4.3.exe – compiler switches set for full debug, no optimization, etc. ; will be slower in execution
    • ARIANT-1.6.4.3-opt.exe – compiled with all debug switches off and optimization switches set to favor speed; will execute faster (with minimal error traceback info)

ARIANT 1.6.4.1

Release Date: 2022-10-31
Changes Include:
  • Compressor system model is now available for use. This model is deemed more appropriate compared to the pump model in gas-only applications such as the high temperature gas SMRs.
  • Revised logic to limit unreasonably high phase velocities in order to allow the code to recover faster from abnormal conditions.
  • New numeric option to reduce time step control strategy output in *.lis and *.lg files: 'NO-DT-LOG'. This option is recommended for use in “production” runs, limiting file sizes to a minimum.
  • Various other (minor) output formatting changes.
  • Please note that there are two executables corresponding for this release:
    • ARIANT-1.6.4.1.exe – this is the release that’s been produced using the same compiler switches (full debug, no optimization, etc.) as in the previous code versions
    • ARIANT-1.6.4.1-opt.exe – this release has been compiled with all debug switches off and optimization switches set to favor speed.
      The user may find that the second code version will be significantly faster and is recommended for use in simulations that require long compute times.

ARIANT 1.6.2.5

Release Date: 2022-10-12
Changes Include:
  • Disappearing phase enthalpy is reset to saturation value at local pressure. The reset is only applied when the phase is assumed to disappear at extremely small (1.0D-07) or large (0.999999D0) void fractions.
  • Time step control logic has been extensively revised.
  • Time Step Control section of all existing ARIANT input decks must be modified. An example is provided below (note that there are two lines of fewer input required for this section):
    'TIMESTEP CONTROL'/
    1.0/
    1.75,0.5/
    0.66667,1.33333/
    ! P[%],void[-],hg[%],hf[%],vg[%],vf[%],iter,RG,Tw[C]
    10.0,0.05,10.0,10.0,300.0,300.0,50.0,100.0,10.0/ ! Check input manual for description of these values
  • The Input and Theory Manuals have been updated to document the usage and features of the new time step control algorithm. These documents are now available on the ARIANT website. Please note that these documents are still in draft and have been provided to help users with input preparation to expedite the transition. Formal released versions of Input and Theory manuals are still available on the ARIANT website.
    • Please note that there are two executables corresponding for this release:
    • ARIANT-1.6.2.5.exe – this is the release that’s been produced using the same compiler switches (full debug, no optimization, etc.) as in the previous code versions
    • ARIANT-1.6.2.5-opt.exe – this release has been compiled with all debug switches off and optimization switches set to favor speed.

ARIANT 1.6.2.2

Release Date: 2022-09-21
Changes Include:
  • Corrected momentum terms at links connecting branches with unequal flow area.
  • Added 'FIX-MIXED' and 'FIX-SEPARATED’ pipe numeric options. These options are applicable to individual branches and should not be confused with the global numeric options ‘ALL-MIXED’ and ‘ALL-SEPARATED’ which are applied to all pipe components in a network.
    It should also be noted that ARIANT allows specification of multiple branch options for the same branch as in the following example:
    'PIPE23',0.5,0.0,2.0,0.06,1.0,1.0,'CIRC',4,'H2O',,,'FIX-MIXED, FRICTION=HTFS’/
  • Momentum transport (upwind) terms at area changes and connections to reservoir components are disallowed.
  • Revised clipping logic for out-of-bound primitive (i.e. P, hg, hf) thermodynamic variables.

ARIANT 1.6.2.1

Release Date: 2022-09-13
Changes Include:
  • Revised assignment of upwind difference terms at links connecting branches with different flow area.
  • Added numeric option \verb+$NO-UPWIND+ to disallow momentum transport for testing purposes only. Option to be used with care and to be disabled in production runs.
  • Revised to ensure when ALL_GAS numeric option is specified or noncondensable gas is present at pump intake, pump head generated is applied to the gas phase. This also addresses PR-ariant-1.6.1.1-02
  • Corrected calculation of average link length in calculation of the momentum term for pressure gradient. This revision also addresses previously observed grid dependence under certain scenarios.
  • Added velocity limit check right after the system matrix is inverted. A choking check on velocities are performed during the Newton iteration, limiting velocities to sonic speed. However, a limit imposed after system matrix inversion helps code to recover from possible divergence.
  • Output between a multi-link connection and internal link is handled as the nearest internal link. This also addresses PR-ariant-1.1.2.1-02.
  • Set default for Colebrook wall friction factor to CATHENA implementation to enable users reproduce previous CATHENA results. A more accurate relation is available in the code and will be made available under a numeric option in a future release.

ARIANT 1.6.1.1

Release Date: 2022-08-25
Changes Include:
  • This is a major release as indicated by the increment of the second digit in the version tracking number. This version enables modelling of thermal radiation heat transfer between N-solid bodies where N depends on the number of surfaces being modeled.
  • Note that ARIANT user Input manual has not yet been updated to include the radiation heat transfer model. For examples of usage or guidance in CANDU, SMR or other applications, please send a request to N. Aydemir until an updated version of the user Input Manual is available.

ARIANT 1.5.6.2

Release Date: 2022-08-19
Changes Include:
  • This version has been released to enable analysts to proceed with their work, addressing a number of recently raised Problem Reports (PRs):
      PR-ariant-1.5.4.1-02
    • PR-ariant-1.5.4.4-03
    • PR-ariant-1.5.6.1-01
    • PR-ariant-1.5.6.1-03
    • PR-ariant-1.5.6.1-04

ARIANT 1.5.6.1

Release Date: 2022-08-07
Changes Include:
  • A number of issues identified during ongoing verification efforts have been addressed. A key revision has been in the calculation of interfacial stress under annular flow conditions. Current default has now been set to Modified Wallis correlation since previous default (Stevanovic correlation) has been observed to result in instabilities. A numeric option may be provided in a future release to recover the Stevanovic correlation if, desired,
  • Revision of break discharge flow for superheated gas flows,
  • Calculations of interfacial shear stress has been moved to an upper level call, outside the loop for the construction of the Jacobian matrix. The main reason for this change has been to accelerate the computations without any observable changes in the results. This option is available under the numeric option 'NEW_INT_FRICT'. Once this release is fully tested, this will be the default option and users will no longer have to use this numeric option. Until that time, it is recommended that all input decks include this numeric option
  • Added support for Developing PDO option, available under Heat Transfer Package models. In previous versions, use of this option resulted in a warning message in the *.lis file. Use of this option has been fully documented in ARIANT Input Manual,
  • A performance issue in the calculation of TCHF has been addressed,
  • Enabled perturbation with respect to downstream pressure in the construction of Jacobian in break discharge calculations,
  • Addressed PR-1.5.4.4-01 (code output of noncondensable gas was incorrect when flow boundary condition is specified by mass; now resolved),
NOTE: It is recommended that Numeric Option 'NEW_INT_FRICT' is enabled for all two-phase flow simulations. This is not required for noncondensable loops such as those using Helium as coolant.

ARIANT 1.5.4.3

Release Date: 2022-05-23
Changes Include:
  • Address an initialization issue in one of the subroutines that compute pump head. The issue led to an unexpected increase in mass flow rate (under certain conditions, for molten salt coolants only) when the simulation was performed under the Linux platform. This problem was not observed under Windows platform.
  • Revised phase enthalpy definitions used in the interface energy exchange to ensure energy transfer is consistent with the state of boiling or condensation in a node.
  • Relaxed convergence criteria for all fields for the first time step. This is expected to lead to a smoother start to the simulation for cases where the user specified initial conditions may not be reasonable. This change allows the code to self-initialize as driven by the applied boundary conditions.
  • Modified the openFile subroutine to remove the check if a TEMPFILE already exists and print an error message if it did. If the optional success variable wasn't passed, the error was ignored and the file opened anyway. This caused spurious error messages in the list file. This change addresses PR-ariant-1.5.4.1-01.
  • These changes are not expected to affect ongoing RD-14M simulations significantly. However, ongoing simulations of the MSRE cases are expected to be impacted.

ARIANT 1.5.4.2

Release Date: 2022-02-18 Changes Include:
  • This is a special release to address an issue observed in an ongoing FST project on a priority basis. This release includes changes in modules that relate to ARIANT HEAT PIPE model and addresses PR-ariant-1.0.0.1.29a.exe-02 that has been logged earlier. Problem resolution includes setting minimum pressure of liquid metals (Sodium and Potassium) to Triple Point pressure.

ARIANT 1.5.4.1

Release Date: 2022-02-01
Changes Include:
  • Addressed PR-ariant-1.5.2.1-04 : Introduce '$REV-SLUG-TRANS'. This option modifies the transition smoothing in the mixed flow regime. It allows the user to revert to the implementation of mixed flow regime transition boundaries consistent with ARIANT Theory Manual. If the option is not turned on, the implementation is identical to that used in C3.
  • Resolved PR-ariant-1.5.2.1-05: Resolved as a consequence of the resolution of PR-ariant-1.5.2.1-04
  • Resolved PR-ariant-1.5.2.1-06: Missing controllable variable type for “VALUE_R” is now assigned
  • 'NO-SLUG' pipe component option is added. This option suppresses the slug flow portion of the default mixed two-phase flow regime map. This option is recommended for the external flow modelling of PIPE components containing vertical tube or pin bundles (i.e., a steam generator secondary side)

ARIANT 1.5.2.1

Release Date: 2022-01-03
Changes Include:
  • ARIANT system Jacobian matrix is constructed numerically. This required users to enter perturbation values for each field variable under the ‘CONVERGENCE CONTROL’ section of the user input deck. This revision allows users to default these values, allowing ARIANT to compute them internally,
  • Minor modifications in interface velocity and interface mass transfer subroutines where comparisons against limiting void conditions were incorrectly made against 1.0 or 0.0 instead of agmin and agmax,
  • Pressure and enthalpy clipping following the inversion of system matrix implemented. This logic was already present in the code, however, was commented out pending testing. Current version activates these code lines, addressing performance issues observed in ongoing RD-14M simulations.

ARIANT 1.5.1.2

Release Date: 2021-12-07
Changes Include:
  • Addressed division by zero and initialization issues identified (under certain conditions) in the RD-14M pump model,
  • Addressed consistency issue (between horizontal and inclined pipes) in the calculation of flow regime criterion for transition to turbulent mixed flow,
  • Added support for use of solar salt properties, and
  • Revisions to implementation of ‘ALL-LIQUID’ and ‘ALL-GAS’ numeric options.

ARIANT 1.4.4.2

Release Date: 2021-11-19
Changes Include:
  • Corrected calculation of mixture enthalpy in an OUTPUT model. This change affects only the output of HMIX; internal calculations of mixture enthalpy are performed correctly.
  • An addressing error in identifying a separator model has been corrected.
  • Revised concentration tracking algorithm (in transport terms) to correctly account for particle concentration flux.
  • Addressed the following nonconformance reported by ARIANT users/developers (see ARIANT website for full description of issue and resolution)
    PR-ariant-1.4.2.3-01
    PR-ariant-1.3.2.2.exe-01

ARIANT 1.4.2.3

Release Date: 2021-10-20
Changes Include:
  • PR-ariant-1.3.2.2-03 – added specification by Kelvin option when ICs specified with the ‘ALL TEMPERATURES’ option
  • PR-ariant-1.4.2.1-01 – revised to correct an inconsistency in output of internal heat generation value

ARIANT 1.4.2.1

Release Date: 2021-09-29
Changes Include:
  • Revised Heat Pipe model (corrected an NaN error that was missed by the compiler)

ARIANT 1.4.1.3

Release Date: 2021-09-23
Changes Include:
  • Heat Pipe model is now available, supporting water, Potassium and Sodium as working fluids,
  • A number of additional flow regime uncertainty variables added for circular, 7 and 37-element pin bundles.

ARIANT 1.3.2.2

Release Date: 2021-06-14
Changes Include:
  • Supports various molten salt fluid types: LiF-BeF2 (Flibe), NaBF4-NaF, LiF-NaF-KF (Flinak), and NaF-ZrF4. The molten salt version of ARIANT will formally be verified during July and August against available data. Additional molten salt types may be added if and when required.
  • Introduced numeric option ‘ALL_GAS’: If this option is selected, the code will operate in single-phase gas mode where only equations for the gas-phase will be solved. This option is the opposite of the recently introduced ‘ALL-LIQUID’ numeric option where only single-phase liquid equations are solved. Use of either of these options are highly recommended if it is known that a circuit will only contain (and remain in) single-phase fluid such as a Helium gas or a molten salt. The advantage of using one of these options is the drastic reduction in compute time. It should be noted that it is possible to have a simulation where one circuit contains He gas and the other another fluid type such as water (a heat exchanger).
  • Revision to include initialization of standard deviation for film boiling look-up table for uncertainty analysis.
  • As of this version, INTEL compiler has been updated to Intel® Visual Fortran Compiler extension version 19.1.0057.16. This applies to Windows versions of ARIANT as of the present release. Compile and link options are always reported at the end of each code run in the *.lis file as well for those interested.

ARIANT 1.2.1.1

Release Date: 2021-05-27
Changes Include:
  • Introduced numeric option ‘NEW_INT_FRICT’:
    If this option is selected, the code will use the recently developed interfacial friction module. This module is still under verification and will be the default code option was once verification is complete.
  • Defaults for 'USER INTERFACE HT' are now properly specified in the code.
  • Mass and energy conservation correction terms are revised to account for the change of time step size when the time step control logic increases or decreases the current time step size.
  • Additional output has been added in the *.lis file to indicate if a link is choked (along with a display of local sound speed)

ARIANT 1.1.1.1

Release Date: 2021-05-10
Changes Include:
  • Introduced numeric option 'ALL-LIQUID', to allow simulation of liquid-only flows
  • Replaced numeric option ‘HTP-OUT’ with numeric option ‘HTP-IN’. The former option is no longer supported. Default value for option ‘HTP-IN’ has been set to zero (0). This results in calls to HTP package being placed outside the Newton loop. Users can recover previous code version behavour by specifying the ‘HTP-IN’ option.
  • Addressed the following nonconformances reported by ARIANT users/developers
    PR-ariant-1.0.0.1.27.exe-03
    PR-ariant-1.0.0.1.28b.exe-07
    PR-ariant-1.0.0.1.29.exe-01
    PR-ariant-1.0.1.1.exe-01
    PR-ariant-1.0.1.1.exe-02

ARIANT 1.0.1.1

Release Date: 2021-01-23
Changes Include:
  • revision of interfacial friction model
  • Inclusion of the more general interf_shear_m module

ARIANT 1.0.0.1.31

Release Date: 2020-12-03
Changes Include:
  • Revisions to replace select intrinsic functions with more generic form
  • Introduced module for trigonometric unit conversions
  • Format changes in view factor matrix output

ARIANT 1.0.0.1.22

Release Date: 2020-03-04
Changes Include:
  • New OUTPUT model to optionally leave files OPEN (default behavior is files closed after every WRITE)
  • Additional heat transfer variables are now available under the UNCERTAINTY model
  • Additional support for the TAT project (blood flow simulation) which addressed a number of issues observed in 1.0.0.1.20