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Showing results 1 to 12 of 12 Search took 0.00 seconds. Search: Posts Made By: new_at_this

Forum: Main CFD Forum December 23, 2011, 21:16

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this Pretty much i went back to the basics. I had... Pretty much i went back to the basics. I had checked my code over and over again while also talking to others and I couldn't find an issue with my boundary conditions. I ran the original seibold code...

Forum: Main CFD Forum December 22, 2011, 15:17

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this I believe that I figured out my problem. It... I believe that I figured out my problem. It turned out I was applying the boundary condition properly, but I had modified the code with a scaling constant to account for rectangular domains which was...

Forum: Main CFD Forum December 21, 2011, 23:57

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this so this is code is driving me crazy. I'm going to... so this is code is driving me crazy. I'm going to post it up here and if someone has some time to look at it I would really appreciate it. The code is based off the lid driven cavity written by...

Forum: Main CFD Forum December 21, 2011, 15:07

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this Thanks, I actually went out and borrowed the... Thanks, I actually went out and borrowed the book. I think there is a section that explains how to define the boundary condition for the staggered grid. I have yet to try it out though

Forum: Main CFD Forum December 21, 2011, 14:08

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this I think that my problem is the residual... I think that my problem is the residual truncation error mentioned by mettler. Does Roache mention what the flux should be set to? It seems to me that it would be dependent on how far away the first...

Forum: Main CFD Forum December 20, 2011, 18:13

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this I don't define the center line velocity but i... I don't define the center line velocity but i du/dy across the line of symmetry which from what I read should be a sufficient boundary condition. I think the issue is that I did not change the...

Forum: Main CFD Forum December 20, 2011, 16:19

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this my symmetry line is at 0.5 and U is only defined... my symmetry line is at 0.5 and U is only defined at i=1,2,3,4,5.... So when the symmetry is defined at 0.5, U at 0 equals U at 1 which I think is the equivalent of what you are saying. Shifting the...

Forum: Main CFD Forum December 20, 2011, 15:40

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this i is in the y direction. But my ghost point below... i is in the y direction. But my ghost point below the line of symmetry is actually equal a point the same distance above the line of symmetry since it was done on a staggered grid. u doesn't exist on...

Forum: Main CFD Forum December 20, 2011, 14:53

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this bottom BC: u(i-1) = u (i) or u(ghost) =... bottom BC: u(i-1) = u (i) or u(ghost) = u(interior), v = 0 These are the BCs that i'm using for those pics. They are the same as before just with a higher grid resolution

Forum: Main CFD Forum December 20, 2011, 12:49

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this i've found out that my code gets better results... i've found out that my code gets better results if I increase the number of grid point. This makes sense since if the grid points are further from the axis of symmetry, then the flux is not exactly...

Forum: Main CFD Forum December 20, 2011, 09:51

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this nope, i coded in primitive variables nope, i coded in primitive variables

Forum: Main CFD Forum December 19, 2011, 13:05

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By new_at_this symmetry boundary condition? I am solving the incompressible navier stokes equations for flow in a cylinder using matlab. My code uses a staggered grid and a fractional step method. For u I need to define a symmetric BC on the...

Showing results 1 to 12 of 12

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