|
[Sponsors] |
what are the best solvers for P, U, cellDisplacement for overPimpleDyMFoam |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
May 21, 2019, 21:40 |
what are the best solvers for P, U, cellDisplacement for overPimpleDyMFoam
|
#1 |
New Member
H.Ham
Join Date: Mar 2019
Posts: 21
Rep Power: 7 |
Hi Guys,
I am a new Openfoam user, and i am currently working on flow around an airfoil profile (externel flow). I work with overPimpleDyMFoam (transient regime), my mesh is 100k cells (using overSet Mesh) my problem is that my simulation takes a lot of time, to reach a duration of 0.2 second, my computer calculates during 2 days (it's huge time) knowing that my current number maxCO = 8, and y + = 10. Please help me !!!!!!!! please, !!!!!! |
|
May 23, 2019, 05:50 |
|
#2 |
Member
Thomas Sprich
Join Date: Mar 2015
Posts: 76
Rep Power: 11 |
Hi Hamdani,
I think you are unlikely to get a best fit answer as often the choice of solver is subject to the type of geometry and determining the best choice is a case of trial and error. I have used the following in a overInterDyMFoam simulation I ran: Code:
"cellDisplacement.*" { solver PCG; preconditioner DIC; tolerance 1e-09; relTol 0; maxIter 100; } Code:
"(U|k|omega|epsilon).*" { solver PBiCG; preconditioner DILU; tolerance 1e-015; relTol 0; } You can always try reduce the size of the overset region. This should be minimised to reduce the number of cells that have to be calculated. I have read you need at least four cells around your geometry for overset. You could look at your mesh resolution, although this is probably a last resort. Lastly, your courant number is quite high, test to see if lower values give you less iterations to your convergence for your Correctors. Maybe as your simulations stabilises you can increase the courant number. If its any consolation, this simulation also took me a long time to solve. I'm sorry I can't offer you a better answer than that. Good luck, Thomas |
|
May 23, 2019, 06:39 |
|
#3 |
New Member
H.Ham
Join Date: Mar 2019
Posts: 21
Rep Power: 7 |
HI Thomas,
thank you very much Thomas, I will take into consideration everything you said to me, you helped me very well You will find attached "systeme folder " - yes I use the version v1812 which is compatible with oversetMesh - My computer : Intel xeon 12 cores, RAM 32GB, - Yes i'm running the simulation in parallel with : ---------------------------------- numberOfSubdomains 10; method hierarchical; coeffs { n (5 1 2); delta 0.001; // default=0.001 //order xyz; // default=xzy } ---------------------------------------- cfd_Online1.png cfd_online2.jpg checkMesh.jpg solver.jpg system.zip |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
OpenFOAM solvers for two-phase boiling flows | Coris | CFD Freelancers | 1 | May 22, 2019 04:54 |
Solid Mechanics Solvers added to OpenFOAM Extend | bigphil | OpenFOAM Announcements from Other Sources | 26 | October 12, 2017 05:01 |
Is there a difference between Riemann solvers and characteristic based solvers? | linkamp | Main CFD Forum | 3 | February 18, 2016 10:12 |
FSI solvers - best solvers | steven123 | OpenFOAM Running, Solving & CFD | 0 | July 8, 2014 11:26 |
Possible turbulence modelling bug in SRF solvers | otm | OpenFOAM Running, Solving & CFD | 3 | May 29, 2012 05:03 |