Running the Simulation

You define 3 reports to monitor the run progress for a multi-timescale simulation. One report outputs the current coupling cycle. The other two count the iteration numbers for the fluid and solid thermal solutions respectively.

  1. Create a coupling iteration annotation from the parameter LoopCounter, which counts the current coupling cycle:
    1. Right-click the Reports node and select New > User > Expression.
    2. Rename the report to Coupling Iteration.
    3. Select the Coupling Iteration node and set Definition to $LoopCounter.
      The report accesses the value from the parameter LoopCounter.
    4. Right-click the Coupling Iteration node and select Create Text Annotation from Report.
    5. Select the Tools > Annotations > Coupling Iteration node and drag-and-drop it into the Temperature scene.
  2. Create a report that counts the number of fluid iterations:
    1. Right-click the Reports node and select New > System > Physics Continuum Iteration.
    2. Rename the report to Iterations: Fluid.
    3. Select the Iterations: Fluid node and set Physics Continuum to Thermal Analysis - Gas Physics.
    4. Right-click the report and select Create Monitor from Report.
      A new node Iterations:Fluid Monitor appears under the Monitors .
  3. Create a report that counts the number of solid iterations:
    1. Right-click the Reports node and select New > System > Physics Continuum Iteration.
    2. Rename the report to Iterations: Solid.
    3. Select the Iterations: Solid node and set Physics Continuum to Thermal Analysis - Manifold Physics.
    4. Right-click the report and select Create Monitor from Report.
      A new node Iterations:Solid Monitor appears under the Monitors .
  4. To monitor the steady fluid residuals using the steady iteration number:
    1. Rename the residual plot Plots > Residuals to Fluid Plots.
    2. Select the Fluid Plots node and set X-Axis Monitor to Iterations: Fluid Monitor.
  5. To monitor the transient solid energy residuals using the transient iteration number:
    1. Right-click the Monitors > Energy node and select Create Plot from Monitor.
    2. Select the Plots > Energy Plot node and set X-Axis Monitor to Iterations: Solid Monitor .
To run the simulation, you first activate the MultiTimeScale Workflow on the toolbar.
  1. Within the Solution toolbar, click Set Active Simulation Operations and select MultiTimeScale Workflow.
To start the managed simulation:
  1. Right-click the Automation > Simulation Operations > MultiTimeScale Workflow and select Play/Resume Simulation Operations.
    The simulation starts with the steady fluid solver until the associated stopping criterion is fulfilled. The transient solid solver is then activated while the steady solver is inactive.
    Note To stop the workflow, click on Stop on the tool bar. To restart solver iterating, right-click again the MultiTimeScale Workflow node and select Play/Resume.
  2. Save the simulation.