Hi everyone,
I am trying to solve a multiphysics problem in a complicated 3D domain of fluid and and solid medium. Governing equations, solved for are Continuty, Momentum and a Modified Energy equation. Physics that I am using in COMSOL are Fluid flow and Coefficient form PDE. I am using Fully coupled direct linear time dependent solver. Degrees of freedom solved for=1758657, total mesh number of elements=1200134, avg element quality=.7399, min element qualiyy=1.02e-5
During simulation, after 0 time step, its showing "Inconsistent unidirectional constraints found. 1860 constraint force columns are merged/removed." And the solver is taking too long time to solve the problem. It takes 4 days already for just 20 sec study out of 650 sec in my model. I am using double processor(XEON) workstation with 64 gb RAM. 1758657
Can anyone help me in this, to know the reason behind it and how to reduce the solution time.