Error in miu_fsi coefficient

I'm trying to simulate the deformation of a membrane to a fluid flow, but trying to solve it immediately gives me the error "error in miu_fsi coefficient".

Here's the settings:



May i ask if i'm doing something wrong?

Hi Timmy,

Thank you for reporting the issue. Could you possibly attach an actual model file saved just before you encounter the error, as it makes it much faster and easier to reproduce issues.

Sure. Here it is.
In this model i applied a small modification where i lowered the height under the hypothesis that the fluid may need to have a space to pass through. But it still give me the same exact error. NewTest.fea

Thanks for attaching the model.

It seems specifically for the FSI mode does not parse/substitute the coefficients as expected, so for now you will have to use the actual values instead of 'rho' or 'mi' in the Equation dialog coefficients. Moreover, the expression for 'E = ((270-250)/(0.298-0.258))e2' is invalid as the exponent 'e2' can only be affixed to numerical values, in this case you could do something like '((270-250)/(0.298-0.258))*1e2'.

thank you for the answer. However the system still keeps giving me the error message "matrix is singular to working precision" despite there being no reason to do so. TrialCorrected.fea
May i ask what i'm doing wrong (wether it's an input issue or a boundary issure etc.)?