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by julieng
Sat Dec 22, 2018 11:22 pm
Forum: CfdOF / CFD
Topic: Transient or steady state CFD problem
Replies: 22
Views: 1636

Re: Transient or steady state CFD problem

Thschrader, do you tried my 2D laminar case?

Best regards
by julieng
Sat Dec 22, 2018 1:46 pm
Forum: CfdOF / CFD
Topic: Transient or steady state CFD problem
Replies: 22
Views: 1636

Re: Transient or steady state CFD problem

Yes you are right

File attached

Best regards
by julieng
Sat Dec 22, 2018 8:09 am
Forum: CfdOF / CFD
Topic: Transient or steady state CFD problem
Replies: 22
Views: 1636

Re: Transient or steady state CFD problem

I found this from oliveroxtoby: "There are a few different ways of using PIMPLE. With a fixed time step size, it is wise to solve to a particular residual tolerance. One can use a fixed number of iterations if one keeps a limit on the max Courant number. The latter is the mode we use at the moment i...
by julieng
Sat Dec 22, 2018 7:52 am
Forum: CfdOF / CFD
Topic: Transient or steady state CFD problem
Replies: 22
Views: 1636

Re: Transient or steady state CFD problem

Hello, I work nights and days :) , give me a little bit more time please... More seriously I try a simple 2D case of flow past a cylinder. I don't know if my the residual is normal (residual of p higher than 0.1 for all time steps) The Reynolds number in very low 0.5. Mesh is max 10 mm, velocity max...
by julieng
Fri Dec 21, 2018 9:04 pm
Forum: CfdOF / CFD
Topic: Transient or steady state CFD problem
Replies: 22
Views: 1636

Re: Transient or steady state CFD problem

Yes i have a lot of homework, my boss want answers.
I compare with elmer in 2d cases

Best regards
by julieng
Fri Dec 21, 2018 11:28 am
Forum: CfdOF / CFD
Topic: Post processing tools
Replies: 8
Views: 549

Re: Post processing tools

Hello thschrader,

I have done "compute cell normals" and also choose cell data in the integration list.

Best regards
by julieng
Fri Dec 21, 2018 5:26 am
Forum: CfdOF / CFD
Topic: Post processing tools
Replies: 8
Views: 549

Re: Post processing tools

Hello

Do you know how to plot the drag and lift forces on function of time with paraview?

I do the same steps extract surface, generate normals, calculate pressure x normal x Rho.

If i try integrate variable and plot other time i have nothing in my graph.

Best regards
by julieng
Wed Dec 19, 2018 10:37 pm
Forum: CfdOF / CFD
Topic: Transient or steady state CFD problem
Replies: 22
Views: 1636

Transient or steady state CFD problem

Dear all, I continue my CFD learning. I don't understand when I can compute turbulent cfd problems in steady or in transient simulations ? It is impossible to know before the simulation if the flow will be steady or not. What should I do; try first a steady state case (play with the mesh) and if it ...
by julieng
Wed Dec 19, 2018 11:32 am
Forum: CfdOF / CFD
Topic: Wall function with k-w SST
Replies: 4
Views: 597

Re: Wall function with k-w SST

Thank you for your answer. It is not clear for me if the actual version of cfdOF solver k-w SST use or not wall functions ? I think not but I need a confirmation. To summarise, correct me if I am wrong (with the k-w SST turbulence model): 1- If I want to calulate fluxes, forces ... near the walls, I...
by julieng
Tue Dec 18, 2018 8:59 pm
Forum: CfdOF / CFD
Topic: Wall function with k-w SST
Replies: 4
Views: 597

Wall function with k-w SST

Dear all, Does CfdOF employs a wall function ? If yes which one? https://www.cfd-online.com/Forums/openfoam-solving/86855-near-wall-treatment-k-omega-sst.html I understand that k-w SST without wall function is a ind of Low Re model needing a y+ <1 (or close to 1). When used with a wall function (nut...

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