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browns6 January 9, 2013 15:59

Inlet Motion with 2-way FSI

I am running a 2 way FSI simulation of a pipe. The inlet is specified to move in the x, y and z directions with zero radial rotation. The inlet flow is time varying, (uniform profile for one simulation and uvw velocities for the second simulation). I am having problems with convergence of the FSI model. Both the fluid model and the shell converge separately, but not when linked together. Length of the pipe runs axially in the z direction with xy being the inlet plane.

There is a warning: "In Analysis 'Flow Analysis 1' - Domain 'Default Domain': Mesh motion is specified on the boundary 'Inlet'. This is valid for motion that is tangential to the boundary but solution errors will occur if motion is normal to the boundary." that occurs in the FSI set up.

Does this warning mean that if the inlet moves in xyz directions and the flow is normal to the inlet, there is no way a solution can be obtained for the model?

I have run the model previously with just z inlet motion and it converges with no errors.


ghorrocks January 12, 2013 16:25

You can still do the simulation, but the error message says the normal motion component will not be taken into account. It will converge fine and report no errors, but may not be correct... but may be close enough - that depends on what you are simulating.

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