Unsteady field advected by steady velocity field

t.oliveira · November 15, 2015, 20:07

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.

akidess · November 16, 2015, 02:53

Compute velocity field with simpleFoam, concentration transport with scalarTransportFoam.

t.oliveira · December 28, 2015, 14:42

Thank you, Anton. It worked.

November 15, 2015, 20:07	Unsteady field advected by steady velocity field	#1
t.oliveira Senior Member Thomas Oliveira Join Date: Apr 2015 Posts: 114 Rep Power: 12	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
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 30	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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Reading Velocity field every time step	alib022	OpenFOAM Programming & Development	19	December 23, 2019 19:42
conservative form twoPhaseEulerFoam23x gives an unsatisfactory velocity result.	sharonyue	OpenFOAM Running, Solving & CFD	12	April 10, 2016 00:30
VELOCITY vs VELOCITY IN STN FRAME vs RELATIVE VELOCITY	everest20	FLUENT	1	July 13, 2015 09:35
''unknown radialModelType type Gidaspow'' PROBLEM WITH THE BED TUTORIAL	AndoniBM	OpenFOAM Running, Solving & CFD	2	March 25, 2015 19:44
Steady needs unsteady.	nico	Main CFD Forum	0	September 21, 2007 05:50

December 28, 2015, 14:42		#3
t.oliveira Senior Member Thomas Oliveira Join Date: Apr 2015 Posts: 114 Rep Power: 12	Thank you, Anton. It worked.