Hello,

I am new to NGSolve, I am trying to write the bilinear form and the linear form for the Stokes problem, but I get an error as follows

.

f = LinearForm(X)

f +=InnerProduct(rhs,v)*dx #Use the code to calc the righthandside
f +=InnerProduct(U_ex,v) ita/hds(skeleton=True)
f +=InnerProduct(grad(v)n,U_ex)
f.Assemble()
—> 33 f +=InnerProductb[/b][b][/b]dx #Use the code to calc the righthandside 34 f +=InnerProductb[/b][b]*[/b]ita/h*dsb[/b] 35 f +=InnerProductb[/b]

NgException: In MakeLinearFormIntegrator: must not have TrialFunction

v is a test function not a trial function

Any help would be really appreciated

Thank you