# Unsteady field advected by steady velocity field

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 November 15, 2015, 20:07 Unsteady field advected by steady velocity field #1 Senior Member   Thomas Oliveira Join Date: Apr 2015 Posts: 114 Rep Power: 11 Dear all, I want to solve the time-dependent advection-diffusion equation of a concentration that is advected by a velocity field which is the steady-state solution of a creeping flow problem. I need to solve both for the steady-state velocity field and the time-dependent concentration field, but I am not sure what is the best strategy to do that using OpenFOAM. One approach would be to solve a single time-dependent problem involving both fields, as if both were unsteady. However, I guess that solving first for the velocity and then for the concentration would be computationally more efficient that recomputing the steady-state velocity field at every timestep. Could you please share you thoughts on it? Thank you for your attention.

 November 16, 2015, 02:53 #2 Senior Member     Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29 Compute velocity field with simpleFoam, concentration transport with scalarTransportFoam. t.oliveira likes this. __________________ *On twitter @akidTwit *Spend as much time formulating your questions as you expect people to spend on their answer.

 December 28, 2015, 14:42 #3 Senior Member   Thomas Oliveira Join Date: Apr 2015 Posts: 114 Rep Power: 11 Thank you, Anton. It worked.

 Tags advection-diffusion, steady and unsteady state

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