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Changing boundary type in the middle of a study (poroelasticity module)
Posted May 24, 2012, 12:18 p.m. EDT Porous Media Flow, Structural Mechanics Version 4.2a 1 Reply
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I'd like to change the boundary condition type in the middle of a time-dependent study in the poroelasticity module. Specifically, I'd like to have an inflow boundary condition for 0<t<1, and then switch to a pressure boundary condition for t>1. I've tried splitting the two conditions into two separate studies, using the results from the first study as the initial conditions for the second study, but that doesn't seem to be working correctly (e.g. if I check the last value of velocity in the first study and compare it to the first value of velocity in the second study, they don't match). It would also be nice if I could have the results all in one study so that I can plot the results continuously. Any ideas on how to do this?
1 Reply Last Post May 24, 2012, 2:46 p.m. EDT
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Posted:
1 decade ago
Hi
Today in V4.2a, apart from using Matlab to drive COMSOL I believe you can only drive itmanually, perform one study, stop, change xour BCs and continue using the stored solution as initial conditions for the next step. You cannot avoid having some ringing when you switch BC so drastically in the middle if you are in a time dependent solver sequence but it should still work.
With the new version we will have BC depending on the solver, so thes might be linked, remain how to handle the "switching" when these are NOT done smoothly by continuously derivable functions
--
Good luck
Ivar
Today in V4.2a, apart from using Matlab to drive COMSOL I believe you can only drive itmanually, perform one study, stop, change xour BCs and continue using the stored solution as initial conditions for the next step. You cannot avoid having some ringing when you switch BC so drastically in the middle if you are in a time dependent solver sequence but it should still work.
With the new version we will have BC depending on the solver, so thes might be linked, remain how to handle the "switching" when these are NOT done smoothly by continuously derivable functions
--
Good luck
Ivar