I am trying to carry out 3-D hydrodynamic stability analysis of 2-dimensional lid-driven square cavity flow at Re = 200.

I have calculated the 2-dimensional base flow at Re=200 and validated the base flow results with existing literature.

I would like to calculate the eigenvalues for the above-mentioned problem. I am not able to implement the stability analysis calculation in FreeFem.

There is a hydrodynamic stability problem implemented in ‘SLEPc-complex’ avaiable in FreeFem website.

I would like to implement my hydrodynamic stability code without any packages like SLEPc and PETSc. I am not able to find enough guidelines on implementation of hydrodynamic stability problem in FreeFem.

I would be extremely grateful if you please guide me on the implementation of hydrodynamic stability problem in FreeFem.

Looking forward to your kind reply. Thanks in advance.