CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Pressure-velocity coupling with SIMPLE/SIMPLEC for incompressible steady-state

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree2Likes
  • 1 Post By Arya_the_Rabbit
  • 1 Post By Artur.Ant

LinkBack Thread Tools Search this Thread Display Modes
Old   February 12, 2017, 11:15
Default Pressure-velocity coupling with SIMPLE/SIMPLEC for incompressible steady-state
New Member
Join Date: Feb 2017
Posts: 9
Rep Power: 5
Arya_the_Rabbit is on a distinguished road

I have problem to set up a pressure-velocity coupling solver in OpenFoam due to discordant opinion I've found online.

I would like to use a coupled solver for an incompressible steady state case in order to improve the convergence speed and the robustness of the solution.

I've found that for solve together the flow equations I need to set "type coupled" in the U solver in fvsolution, but I haven't found anything about the most appropriate linear solver to use (i.e. GAMG, PCG) and the pressure-based algorithm to use (SIMPLE, SIMPLEC, PISO).

So far I tried using:
- GAMG for pressure
- PCiGC for velocity and turbulence quantities
- First order and then switch to second order the div U schemes

but the solution is similar to segregated solver. What I would have expected is an earlier convergence with lower residual and a more stable solution.

- Have someone experience in coupling velocity-pressure in OpenFoam? Could I have some advice about numerical schemes and set up of solver?

- I found that SIMPLEC is faster than SIMPLE. Is it true in a pressure-velocity coupling simulation too?

Thanks for your help.
kishore96 likes this.
Arya_the_Rabbit is offline   Reply With Quote

Old   October 3, 2019, 08:12
Join Date: Aug 2014
Location: Italy
Posts: 38
Rep Power: 7
Artur.Ant is on a distinguished road
In openFoam there is no a coupled pressure-velocity solver.
The coupled solver is only for U, in that case the solver couples the velocity in x,y,z direction and solves it in a single matrix at once.
If you use coupled solver you can gain some stability.
In theory (I verified it in some cases) the converged solution found with a segregated solver is prety close (quasi identical) to the coupled solution and vice versa.
For coupled solution you can use PBiCICG or PBiCCCG linear solvers. The type of solver really depend on the problem.
cryabroad likes this.
Artur.Ant is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
The difference between steady state and transient JuPa CFX 36 December 9, 2019 22:50
Wind tunnel Boundary Conditions in Fluent metmet FLUENT 6 October 30, 2019 12:23
Pressure Velocity coupling problem Sunho park OpenFOAM Running, Solving & CFD 0 August 4, 2010 00:22
velocity pressure coupling Winston Gregorio Main CFD Forum 0 March 25, 2007 16:30
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11

All times are GMT -4. The time now is 07:29.