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Found 2 results

  1. Hi, Mesh independent study is performed for one operating point to fix the mesh count in one of my problem. The final fixed mesh count result was deviating by 1.5% for the selected operating point. The final fixed mesh is used to simulate for other operating points and their results deviate between 10-30%. To check the consistency of the result the simulation is conducted for different operating point to check the stability of solution and found result changes with huge deviation. If this problem persists on my cases, it would be difficult for us to relay on the tool. Requesting you to arrange for a meeting to discuss in detail about this issue ASAP. Regards, Vignesh V.
  2. Whenever AcuPrep sees the same command listed twice in a single input file, it will issue the following warning: *** WARNING: Multiple command issue In many cases, this warning is due to a setting associated with the AUTO_SOLUTION_STRATEGY command. For example, the following input file commands will cause the warning that is shown below: From the input file: ... AUTO_SOLUTION_STRATEGY { max_time_steps = 100 initial_time_increment = 10000000000.0 # sec convergence_tolerance = 0.0001 num_krylov_vectors = 10 relaxation_factor = 0.25 flow = on } STAGGER( "flow" ) { max_linear_solver_iterations = 10000 } .... From the log file: ... acuPrep: Reading AUTO_SOLUTION_STRATEGY acuPrep: Processing AUTO_SOLUTION_STRATEGY acuPrep: AUTO_SOLUTION_STRATEGY: creating and including "fixedMassFlow.ss.inc" ... acuPrep: Reading TIME_SEQUENCE acuPrep: Reading STAGGER( "flow" ) acuPrep: Reading STAGGER( "eddy_frequency" ) acuPrep: Reading STAGGER( "kinetic_energy" ) acuPrep: Reading TIME_INCREMENT acuPrep: Reading TIME_INTEGRATION acuPrep: Reading LINEAR_SOLVER_PARAMETERS acuPrep: Reading CONVERGENCE_CHECK_PARAMETERS acuPrep: Reading ALGEBRAIC_MULTIGRID_PARAMETERS acuPrep: Reading STAGGER( "flow" ) acuPrep: *** WARNING: Multiple command issue ... The reason for this is that the AUTO_SOLUTION_STRATEGY command itself generates a STAGGER( "flow"){} command when it is executed. This can be seen by the fact that AcuPrep displays a message that it is reading STAGGER( "flow" ) after processing the AUTO_SOLUTION_STRATEGY command. So, the fact that I manually added this command to the input file as well leads to the warning. In this case, the command duplication is deliberate because I increased the max_linear_solver_iterations to 10000 for the flow stagger. Note that when modifying the "Advanced Solution Strategy" settings in AcuConsole, these warnings will appear for any of the settings that are modified. The following image shows an example of modifying the settings in a similar fashion as what was described above: Note that if you are receiving these warnings and you are not sure why, it is best to review the input file and the log file to understand what is causing them. Most times, this warning is expected as a result of changes to the solution strategy. However, if it is appearing for other commands, it is important to review your settings to understand why the warning appears.
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