Hello there, I am trying to implement a time-dependent incompressible Navier-Stokes flow, and it ‘sorta works’, but it gets unstable at the outlet when the velocity gets high. I have tried to run the code on a finer mesh and with smaller time steps, but that does not change anything about the inst…

Mixed incompressible Navier-Stokes

dokken November 16, 2020, 1:53pm 2

I would suggest starting with verifying your solver using the Taylor-Green vortex problem or the DFG-2D benchmark, which are both covered in: Boundary Conditions & Convergence for 3D Navier-Stokes

Topic		Replies	Views
Same time dependent temperature problem in two different ways: one works, one doesn't. Why? variational formulation	1	511	August 29, 2021
H(div) function spaces in Navier-Stokes problem General	2	140	April 13, 2024
Convergence in Stokes problem variational formulation	2	237	August 8, 2023
Unable to define linear variational problem a(u, v) == L(v) for all v General	2	102	December 12, 2023
Incorrect taylor-test convergence rate dolfin-adjoint	4	295	May 30, 2023