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Using PZT and FSI in different study steps
Posted 31 déc. 2016, 12:15 UTC−5 0 Replies
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Need help with the following. Hope someone can provide some insight
I have a micropump whose membrane is actuated by a piezo electric. I am using PZD physics to simulate membrane displacement in transient study. I am trying to link this output to the FSI physics (transient again) and achieve a 2 way coupling and hence get an output of final membrane displacement at each time step and also the flow rate at the inlet and outlet (vlaveless pumps) at each time step. For the PZD physics, I am choosing only the PZT (which is my piezo material) domain and the membrane and for the FSI, I am choosing only the membrane and the fluid domains.
I need to give the output of PZD physics at each time step as the first guess input for FSI at each time step. I tried creating 2 studies with the first one only solving PZD and the second one only solving FSI with the values of dependent variables not solved for set to User controlled - Solution-Study 1. And also I am using BDF time stepping with steps taken as strict and maximum time step set at a low value. With these settings, COMSOL is giving an error "Failed to get initial value".
Can someone tell me where I am going wrong or if there is some better way of doing this?
Thanks in advance.
Hello Ajay
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