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Showing results 1 to 9 of 9 Search took 0.00 seconds. Search: Posts Made By: mettler

Forum: Main CFD Forum December 23, 2011, 12:26

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By mettler good for you. You should let everyone know what... good for you. You should let everyone know what keyed you in on that error, so if anyone else is having trouble this might be their answer. Now, convert it to the stream-function/vorticity method...

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

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By mettler its a great book. I have a very early addition... its a great book. I have a very early addition that I got from a professor when he retired..1972 edition. There is a really good section on the streamfunction-vorticity method and its related BCs. ...

Forum: Main CFD Forum December 21, 2011, 14:15

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By mettler no, but he mentions that the error will be on the... no, but he mentions that the error will be on the order of deltaY^3. I think you mentioned that if you have a larger grid that the error is not as much - that would point to the truncation error per...

Forum: Main CFD Forum December 21, 2011, 13:21

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By mettler Also, using the CL at .5 instead of 0 has shown... Also, using the CL at .5 instead of 0 has shown to cause a residual truncation error. This error is in the v-flux and v-momentum across the symmetry line. According to Roache in Computational Fluid...

Forum: Main CFD Forum December 20, 2011, 16:26

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By mettler nowhere in your code do you say that the symmetry... nowhere in your code do you say that the symmetry line has a defined velocity? I think that might be your problem. I am not too sure because I have always had my symmetry line at 0, so I could...

Forum: Main CFD Forum December 20, 2011, 15:54

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By mettler So, your symmetry line is a half-step? For... So, your symmetry line is a half-step? For example, if i = 1 then, ghost cell is at i=0 and symmetry is i=.5? Have you tried putting the symmetry line at i=0, then BCs would be Ui+1 = Ui-1, and Ui...

Forum: Main CFD Forum December 20, 2011, 15:25

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By mettler i is the y-direction? So, your BC says that the... i is the y-direction? So, your BC says that the u-velocity one step below the symmetry line equals the velocity at the symmetry line? That is not correct. Have you tried setting the symmetry-line...

Forum: Main CFD Forum December 20, 2011, 14:35

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By mettler what are you using for the symmetry BCs now? what are you using for the symmetry BCs now?

Forum: Main CFD Forum December 20, 2011, 07:50

Replies: 22 symmetry boundary condition? Views: 3,379 Posted By mettler Are you using the streamfunction-vorticity... Are you using the streamfunction-vorticity equations?

Showing results 1 to 9 of 9

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