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Showing results 1 to 16 of 16 Search took 0.00 seconds. Search: Posts Made By: vkrastev

Forum: OpenFOAM October 19, 2010, 06:24

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Hi all, I'm back again... It seems that... Hi all, I'm back again... It seems that OpenFOAM (at least the 1.6 version) is really, really, sensitive to the convection schemes when someone tries to use a tetrahedron-based unstructured 3D...

Forum: OpenFOAM October 7, 2010, 09:10

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Hi all, I'm sorry I'm a little late...here... Hi all, I'm sorry I'm a little late...here there are some results of my numerical tests on the convection scheme for the turbulent quantities. As I said before, assuming that k and epsilon are...

Forum: OpenFOAM September 30, 2010, 04:59

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Hi Felix, don't worry about the mesh: I posted... Hi Felix, don't worry about the mesh: I posted a more detailed description and the images only for giving you and the other forum readers a better idea of how the mesh itself was built...after this...

Forum: OpenFOAM September 29, 2010, 08:39

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Yes, I'm modeling the Ahmed body, starting with... Yes, I'm modeling the Ahmed body, starting with the simplest case (symmetrical domain, steady state run, body without stilts, 25° slant angle case). You're right about the mesh dimension near the...

Forum: OpenFOAM September 29, 2010, 05:35

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Hi Santiago, this is exactly wath I'm... Hi Santiago, this is exactly wath I'm talking about: as prof. Jasak said, the QUICK original scheme should be unbounded, but in the OpenFOAM usr's guide it is presented as a bounded first/second...

Forum: OpenFOAM September 29, 2010, 05:29

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Hi Felix, my intention for the next steps is to... Hi Felix, my intention for the next steps is to select the two most promising schemes (which seem to be the Gamma and the SFCD ones) and then try to reduce the under-relaxation factors for k and...

Forum: OpenFOAM September 28, 2010, 13:46

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev I'm back... Ok, once again Felix was right: the... I'm back... Ok, once again Felix was right: the turbulent quantities seem to be much more sensitive to the convection scheme type than the mean velocity field...assuming that, I've made several runs...

Forum: OpenFOAM September 24, 2010, 16:37

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Thank you very much for all the answers. Ok, now... Thank you very much for all the answers. Ok, now I'll try first with the velocity convection scheme and then with the other options (underrelaxation parameters and so on). Wait for additional news......

Forum: OpenFOAM September 24, 2010, 11:21

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Hi Felix, thanks for the reply. You're right: in... Hi Felix, thanks for the reply. You're right: in my prior trials I've changed all the divSchemes at the same time. So, I will test your idea and see what happens. Apart from this, I want to pose you...

Forum: OpenFOAM September 24, 2010, 06:38

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Hi all, I have some news: - I've tried to... Hi all, I have some news: - I've tried to use the blended differencing scheme, but if the simulation has to start from the timestep "0" it blows up again after at most 20 iterations (even with a...

Forum: OpenFOAM September 23, 2010, 13:47

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev The conditions are the same posted above,... The conditions are the same posted above, replacing the upwind scheme with the higher-order scheme (limitedLinear/limitedLinearV, vanLeer/vanLeerV, SFCD/SFCDV, etc.) I've tried also to start up...

Forum: OpenFOAM September 23, 2010, 13:42

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev After about 8 corrections the solver stops to... After about 8 corrections the solver stops to iterate because the pressure residual falls under 10^-06. However, setting the number of correctors to 8 the simulation blows up again after 4-5...

Forum: OpenFOAM September 23, 2010, 12:47

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Here it is the checkMesh response: Create... Here it is the checkMesh response: Create time Create polyMesh for time = 0 Time = 0 Mesh stats

Forum: OpenFOAM September 23, 2010, 11:49

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev First of all, thanks for the reply. Secondly,... First of all, thanks for the reply. Secondly, those are the required dicitonaries: controlDict // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // application ...

Forum: OpenFOAM September 23, 2010, 10:09

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Any replies, please? Any replies, please?

Forum: OpenFOAM September 23, 2010, 08:56

Replies: 29 Higher order convection schemes with unstructured grids Views: 16,948 Posted By vkrastev Higher order convection schemes with unstructured grids Hi everybody, I was just wondering who may help me in selecting an appropriate convection scheme for a 3D aerodynamics simulation...The grid is composed of about 2 milion of cells (1.8 milion are...

Showing results 1 to 16 of 16

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