Discussion Forum

Hi

there are many things here that I do not really catch, but I believe also it's because I do not fully understand your model, a few items I can suggest to check:

1) you could probably use the FSI module, as there all three physics are already combined
2) the inlet 1 you set up the velocity with an "s" but you have 3 segments, and s is redefined on each going from 0, to 1 along the edge, have you checked that the initial value velocity is already more or less as expected ?
3) I do not understand "inlet 2" this is a wall not an inlet ? I'm missing something ;)
4) boundary loads 1 and 3 of "0" do not bring anything
5) in the solid Mechanics do not leave an entry empty, add a "0" to the xref (even if you do not use it)
6) in the moving mesh, by default everything is fixed, I believe you should set a free deformation to the fluid part
7) your prescribed mesh displacement is not set you need to define something also for the boundaries
8) remove the not used solver cases and keep only one
9) try to solve only one physics at the time, to check that they are ok, you can also just get the initial conditions loaded to test those also

I still need to understand what you are doing with your set of weak constraints, but that is just that I need to go through the equations, these might be perfectly OK

Still not enough to get it solving.

Again these are comments I would have done differently, not necessarily errors, as your model looks rather complex and I do not believe I fully understand it ;)

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Good luck
Ivar

Thank you so much!
Actually I have this model which is done in version 3.5a by my senior labmates, but I cannot attached it, it is too big!
Do you know someplace I can upload it for you to check it, I really don't know what should I do with it?

It is just the new version is really different from the old one!

Thank you, Mr. Ivar. You are so ice, I will try to do it as you said!

Hi

indeed there are quite some differences, I'm trying to forget all about 3.5 to not get confused, I would say it's better to concentrate on the new (latest) v4

You can always in 3.5 as in v4:
"reset" the model, in v3.5 it also deletes the mesh that might be a hassle as it can be difficult to regenerate, what is no problem any longer in v4.
You can always do a "solve for initial conditions" in v3.5 then the full solution is lost, but the model file shrinks also significantly, before an upload. Sometimes in older version a zip can also help, in the new v4 its already zipped up


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Good luck
Ivar

Sorry for the confusion of my model, I will draw a graph in paper which can describe my model clearly before next time you can check my model for me?

Thank you so much again!