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Search: Posts Made By: syavash
Forum: OpenFOAM Running, Solving & CFD July 2, 2019, 10:37
Replies: 45
Views: 19,420
Posted By syavash
Well, I have uploaded both solver and its test...

Well, I have uploaded both solver and its test case on my Github repository. On my reposityory, one can also find a bunch of useful codes WRT incompressible LES in OpenFoam.
...
Forum: OpenFOAM Running, Solving & CFD July 2, 2019, 10:19
Replies: 45
Views: 19,420
Posted By syavash
Hi, I can only think of the 3rd-order...

Hi,

I can only think of the 3rd-order Runge-Kutta as a reply, which is of-course 3rd-order accurate in time but demands fewer number of pressure correction steps. I have already implemented that...
Forum: OpenFOAM Running, Solving & CFD May 22, 2019, 05:16
Replies: 45
Views: 19,420
Posted By syavash
Well, I think it would be a great idea! However,...

Well, I think it would be a great idea! However, it cannot be employed as a temporal scheme in the current form. Probably some if-clause will be necessary to differentiate between incompressible and...
Forum: OpenFOAM Running, Solving & CFD April 4, 2019, 06:42
Replies: 45
Views: 19,420
Posted By syavash
I guess the main motive behind RK4 was its...

I guess the main motive behind RK4 was its temporal accuracy (4th order) over PISO with 2nd order accuracy. Some acoustic solvers may benefit from that. Putting it aside, I see no particular reason...
Forum: OpenFOAM Running, Solving & CFD April 4, 2019, 06:36
Replies: 45
Views: 19,420
Posted By syavash
Hi, The deltaT term is multiplied by because...

Hi,

The deltaT term is multiplied by because simply it is there in the original N-S equations! Have a look at some numerical textbook on Runge-Kutta algorithm.

Best Regards,
Syavash
Forum: OpenFOAM Running, Solving & CFD April 4, 2019, 06:30
Replies: 45
Views: 19,420
Posted By syavash
Hi, The runtime depends on the number of...

Hi,

The runtime depends on the number of processes as well. I have compared both pisoFoam and RK4 in LES simulations with cell number in order of 1e+8 and over 100 processes. I found them quite...
Forum: OpenFOAM Running, Solving & CFD March 22, 2018, 15:21
Replies: 45
Views: 19,420
Posted By syavash
Dear Yu Cheng, Very good idea. I have...

Dear Yu Cheng,

Very good idea. I have modified the solver to be able to take a constant source term into account. I have also provided a lid-driven cavity example with the new RK4Foam solver. I...
Forum: OpenFOAM Running, Solving & CFD March 18, 2018, 05:23
Replies: 45
Views: 19,420
Posted By syavash
Thanks fo your comment Yu Cheng. I have...

Thanks fo your comment Yu Cheng. I have implemented the RK4 solver with the help of Dr. Vuorinen and your comment. Please check the file attached and let me know if there is something not right with...
Forum: OpenFOAM Running, Solving & CFD August 21, 2015, 12:09
Replies: 45
Views: 19,420
Posted By syavash
Dear Ville, Any comments?!

Dear Ville,

Any comments?!
Forum: OpenFOAM Running, Solving & CFD August 20, 2015, 14:04
Replies: 45
Views: 19,420
Posted By syavash
I changed the pressure dimension in 0/p to [ 0 2...

I changed the pressure dimension in 0/p to [ 0 2 -1 0 0 0 0 ] and the simulation goes on!
But I think a clarification on fvSchemes helps me a lot!
Another point is that I can only see pressure...
Forum: OpenFOAM Running, Solving & CFD August 20, 2015, 11:48
Replies: 45
Views: 19,420
Posted By syavash
--> FOAM FATAL IO ERROR: keyword div(U) is...

--> FOAM FATAL IO ERROR:
keyword div(U) is undefined in dictionary "/media/syavash/science/PHD_Thesis/New/system/fvSchemes.divSchemes"

file:...
Forum: OpenFOAM Running, Solving & CFD August 20, 2015, 11:14
Replies: 45
Views: 19,420
Posted By syavash
All right, As something that migh matter,...

All right,

As something that migh matter, should any modifications be applied in controlDict, fvScheme, or fvSolution?!

Edit: I have encountered the following error during runtime,


-->...
Forum: OpenFOAM Running, Solving & CFD August 20, 2015, 10:13
Replies: 45
Views: 19,420
Posted By syavash
Dear Ville, Now I am really willing to...

Dear Ville,

Now I am really willing to compare runtime of pisoFoam and the new solver together.
Do you mind if I post my observations here?!

Thanks,
Syavash
Forum: OpenFOAM Running, Solving & CFD August 20, 2015, 09:48
Replies: 45
Views: 19,420
Posted By syavash
Thanks for quick reply!! Now I am getting an...

Thanks for quick reply!!

Now I am getting an error like this:


syavash@syavash-VPCF11DGX:~/OpenFOAM/OpenFOAM-2.3.1/applications/solvers/incompressible/rk4projectionFoam$ wmake
options:2:66:...
Forum: OpenFOAM Running, Solving & CFD August 20, 2015, 09:24
Replies: 45
Views: 19,420
Posted By syavash
Thanks Ville, I have proceeded as the steps...

Thanks Ville,

I have proceeded as the steps in your paper have suggested, but I have encountered some problems in creating the new solver:
1-The variables Uold, Uc, and dU are not defined, so I...
Forum: OpenFOAM Running, Solving & CFD August 19, 2015, 16:46
Replies: 45
Views: 19,420
Posted By syavash
Dear Ville, Is it possible to share your...

Dear Ville,

Is it possible to share your incompressible solver?! I am sure many people like me seek for an explicit low-dissipation solver for LES-like simulation.

Syavash.
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