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".
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
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.)?
Are you quite sure of your fluid and solid material parameters are correct? As changing them to for example as in the FSI tutorial does allow for the simulation to run. If these indeed are the parameters you want you probably need a much finer time steps and possibly grid too.