I wish to use the weak form of Navier-Stokes eq in PDEs COMSOL.
I divided the general form into 2 PDEs weak. (first for velocity and second for pressure)
In 2D, the equations work great but in 3D, they don't work.
The boundary condition and everything are same.
the velocity term works in both 2D and 3D.
I guess the issue is related to the pressure term which is:
rho*test(p)*(ux+vy+wz)
the error I get:
- Feature: Stationary Solver 1 (sol1/s1)
Failed to find a solution.
Weak Form PDE 2
Singular matrix.
Thank you for your help in advance.
Armin Ramezanzad
To anyone encountering a similar question:
Just use a suitable boundary condition and analytic function for the inlet velocity.
in a cubic box I used:
Umax*(1-(x/(B/2.5))^2)*(1-(y/(B/2.5))^2)
and it worked.
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