Running the Simulation

As you are seeking the steady-state solution in the fluid and the solid, it is both convenient and valid to initially solve for the fluid flow, then for conjugate heat transfer, and finally solve for the solid displacement while holding the thermal field fixed.

To run the initial fluid simulation:
  1. Edit the Stopping Criteria node and set the following properties:
    Node Property Setting
    Displacement Criterion Enabled Deactivated
    Force Criterion Enabled Deactivated
    Maximum Steps Maximum Steps 100
  2. Expand the Solvers node.
  3. Multi-select the Finite Element Solid Energy and Solid Stress Solver nodes and activate Solver Frozen.
  4. Click (Run).
To solve for the solid temperature, you reactivate the Finite Element Solid Energy and run the simulation. The Finite Element Solid Energy solver allows you to choose between a direct and an iterative solution method. For larger cases, the iterative method speeds up convergence:
  1. Select the Finite Element Solid Energy node and set the following properties:
    Property Setting
    Under-Relaxation Factor 0.999
    Solver Method Iterative
    Solver Frozen Deactivated
  2. Select the Stopping Criteria > Maximum Steps node and set Maximum Steps to 200.
  3. Click (Run).
  4. Open the Plots > Heat Transfer 1 Monitor Plot.
    The heat transfer plot shows that the solution has converged:

To visualize the temperature distribution throughout the gas and the manifold:
  1. Open the scenes, Fluid Temperature and Manifold Temperature.




To solve for the fluid displacement, run the solid stress solver for two iterations:
  1. Select the Stopping Criteria > Maximum Steps node and set Maximum Steps to 202.
  2. Select the Solid Stress Solver node and deactivate Solver Frozen.
  3. Click (Run).
To visualize the thermal expansion and stress on the solid:
  1. Open the scenes, Displacement and von Mises Stress.




  2. Save the simulation.