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Showing results 1 to 13 of 13 Search took 0.00 seconds. Search: Posts Made By: Obad

Forum: Main CFD Forum October 21, 2013, 17:06

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Which book do you mean the book Numerical Methods... Which book do you mean the book Numerical Methods for Conservation Laws? What does weak form of the equations mean? For the FDM I used the Euler equations in strong conservation form (this is...

Forum: Main CFD Forum October 20, 2013, 18:14

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Ok SergeAS you convinced me. I will try it with... Ok SergeAS you convinced me. I will try it with a different technique. Although my current code might work properly, I can't really check it because the calculation would take days... Something...

Forum: Main CFD Forum October 12, 2013, 17:02

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Hy, alright, then I will try it with zero... Hy, alright, then I will try it with zero gradient instead of extrapolation. Does the reduction of the CFL really make the code much more stable. I understand the reason for CFL and of course...

Forum: Main CFD Forum October 12, 2013, 15:44

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Hy, the direction of my velocity is from... Hy, the direction of my velocity is from higher to lower pressure. I did the simulation for two different outlet (not the nozzle exit!) boundary conditions. One where I simply extrapolated all...

Forum: Main CFD Forum October 12, 2013, 12:03

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Hy, concerning the corner, the boundary... Hy, concerning the corner, the boundary condition that I apply to the node at the corner is a free-slip BC. I managed to solve the problem with the instability near the corner. Now I add...

Forum: Main CFD Forum October 9, 2013, 11:58

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Hy, I would like to check my code for... Hy, I would like to check my code for example with the 2D oblique shock problem, but I think this would just produce even more workload, without helping me with my problem... The reason why I...

Forum: Main CFD Forum October 9, 2013, 10:49

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Hey SergeAS, can you tell me which boundary... Hey SergeAS, can you tell me which boundary condition you applied to BC1. Only fixed Mach number? And what about the other values, do you simply extrapolate them? I fixed the values of the Mach...

Forum: Main CFD Forum October 5, 2013, 13:11

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Yes that's true, my solution hasn't reached a... Yes that's true, my solution hasn't reached a steady state yet. But the problem is, that when I do more iterations it starts to diverge... I got some good advice. It is likely that my problem is...

Forum: Main CFD Forum October 2, 2013, 16:33

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Checking the code in a more controlled situation... Checking the code in a more controlled situation is not so easy, then I would have to use a transformed grid, which would complicate it even more... I thought about maybe simulating the supersonic...

Forum: Main CFD Forum September 28, 2013, 08:40

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Thank you Alex, your approach seems reasonable. ... Thank you Alex, your approach seems reasonable. I set the initial Mach number at the nozzle exit to zero and increased it by a small amount each iteration, at the same time I calculate the new...

Forum: Main CFD Forum September 27, 2013, 07:21

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Hy guys, I'm back ;) So I checked my code by... Hy guys, I'm back ;) So I checked my code by putting the input static pressure equal to the output static pressure, furthermore I put the inlet velocity to zero. With this setting my flow field...

Forum: Main CFD Forum September 22, 2013, 18:11

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Thank you for the tip! I will definitely try... Thank you for the tip! I will definitely try to put the same pressure at inlet and outlet. I will let you know if it helped. Cheers!

Forum: Main CFD Forum September 18, 2013, 15:42

Replies: 26 Time-marching scheme diverges Views: 3,486 Posted By Obad Time-marching scheme diverges Hey guys! I'm currently working on the simulation of the flow behind a supersonic nozzle. I tried it for 3 weeks with different versions of the Maccormack scheme, finally I thought I have the...

Showing results 1 to 13 of 13

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