CFD Online Logo CFD Online URL
Home > Forums

Blog Entries

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


A note for CFD developers and the Spalart-Allmaras model

Posted June 12, 2021 at 13:06 by sbaffini (NuTBox)
Updated June 15, 2021 at 07:00 by sbaffini

This is a pretty specific issue which relates to my experience working on wall functions and the Spalart-Allmaras model, but might be useful to others or, more importantly, the users of their code.

If you followed my previous posts here, you know I developed a wall function formulation based on the Musker wall function which, thanks to a math trick, is integrable also for arbitrary Pr/Pr_t (Sc/Sc_t) numbers and also for some forms of non equilibrium terms.

One of the...
Attached Files
File Type: c sa_mu_t.c (2.1 KB, 49 views)
sbaffini's Avatar
Senior Member
Posted in Uncategorized
Views 114 Comments 0 sbaffini is offline Edit Tags

OpenFOAM tips and tricks

Posted March 16, 2021 at 01:44 by sphani4391

I am sharing a few tips and tricks for better OpenFOAM simulations. These are not any new tips I discovered. These are just some which I felt most useful based on my experience.

1. Mesh is the most important aspect - I have spent countless hours fixing issues in other places while the real issue was with my mesh. As a thumb rule, make sure the mesh has: no non-orthogonality issues, low aspect ratio cells, no refinement zones in the region with high gradients

2. Always start...
New Member
Posted in Uncategorized
Views 229 Comments 0 sphani4391 is offline Edit Tags

Boundary conditions for multiphase flow

Posted March 16, 2021 at 01:21 by sphani4391

I have struggled a lot with boundary conditions for multiphase flow, particularly where the multiphase spray is impinging on the outlet patch (typically the case of an internal flow simulation of a fuel injector spray). I have finally settled on the following Boundary conditions which work!

Simulation details: I am doing a 2D axisymmetric flow simulation using a wedge BC at front/ back planes. I am using a custom solver based on homogeneous relaxation model. This is similar to cavitatingFoam...
New Member
Posted in Uncategorized
Views 140 Comments 1 sphani4391 is offline Edit Tags
Rating: 2 votes, 5.00 average.

Turbomachinery Solver OpenFOAM

Posted January 13, 2021 at 12:03 by badpuppet
Updated January 15, 2021 at 13:27 by badpuppet

Turbomachinery Solver OpenFOAM

This forum has been a big source of information for me since I started doing CFD. Now, I want to share my work to thank your altruistic knowledge sharing. Regarding the main topic of this blog, I am going to talk about my first turbomachinery simulations with rhoSimpleFoam, the problems I found with this solver and my solution, which I called turboSimpleFoam. Feel free to ask me whatever you want or tell me if something is wrong.

Attached Thumbnails
Click image for larger version

Name:	results_Comparation_Turbocharger.png
Views:	231
Size:	41.5 KB
ID:	531  
Attached Images
File Type: jpg mesh_Turbocharger.jpg (72.0 KB, 219 views)
File Type: jpg rhoSimpleFoam_Turbocharger.jpg (25.7 KB, 211 views)
File Type: jpg turboSimpleFoam_Turbocharger.jpg (26.4 KB, 221 views)
Attached Files
File Type: zip (256.2 KB, 114 views)
New Member
Views 577 Comments 0 badpuppet is offline Edit Tags

Energies: special issue on microscale and mesoscale modelling

Posted December 22, 2020 at 06:52 by cperalta

I will be editing this special issue of Energies

Contributions from the CFD community are welcome!
New Member
Posted in Uncategorized
Views 202 Comments 0 cperalta is offline Edit Tags

All times are GMT -4. The time now is 01:25.