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

Forum: FLUENT March 25, 2010, 18:44

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser Hi In fact , u will have a bigger numerical... Hi In fact , u will have a bigger numerical diffusion ( truncation error) and u will miss some of the flow motion. If u use a time step dt, u cant correctly simulate any motion with a time...

Forum: FLUENT March 25, 2010, 15:55

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser Hi i dont know how to do this...sorry i can... Hi i dont know how to do this...sorry i can suggest that u use large time steps so u can get a quick solution After getting this 'bad' solution, u can use smaller time steps

Forum: FLUENT March 10, 2010, 20:13

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser AFter u go to plotxy or display contours menus. U... AFter u go to plotxy or display contours menus. U choose Unsteady statistics . ( if ure flow is stationnary, i think it is better for u to do the means values over 4-5 periods....)

Forum: FLUENT March 10, 2010, 17:52

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser U can do the mean values on Matlab (or excel) ... U can do the mean values on Matlab (or excel) If u want to have the means all over the domain, iterate again in Fluent for 1 period of time and dont forget to put yes for data sampling in the...

Forum: FLUENT March 4, 2010, 18:42

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser Hi u must monitor this data and write it to... Hi u must monitor this data and write it to file (solve-->monitors--->surface) Then u can treat it on Matlab or Excel This is the best way If u want to do it on Fluent, u can do data sampling...

Forum: FLUENT December 18, 2009, 18:05

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser yes :) if the mesh is symetric, RANS models... yes :) if the mesh is symetric, RANS models will keep a symetrical flow. If u are interested in mean quantities, use Low-Re Rans models. If u really want unsteady behavior, u must use laminar or...

Forum: FLUENT December 18, 2009, 17:40

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser no problem my friend no need to say sorry but... no problem my friend no need to say sorry but u still do a mistake: laminar model is always the best. The only problem is that it will need very much cells and small time steps. Laminar model is...

Forum: FLUENT December 18, 2009, 17:14

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser Sorry friend, but one more time u do a big... Sorry friend, but one more time u do a big mistake. U did not verify ure flow convergence. LAMINAR STEADY model will NEVER converge in a vortex schedding simulation. (Residuals are NEVER enough to...

Forum: FLUENT December 18, 2009, 16:48

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser laminar model = DNS=the best solution the... laminar model = DNS=the best solution the problem is when Re become high, u will need more cells and a smaller time step... If u are only interested by mean quantities, u can use RANS models but u...

Forum: FLUENT December 18, 2009, 16:26

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser Dear Behrang, in a scientific forum we must not... Dear Behrang, in a scientific forum we must not talk a lot about nationality no??? U have done it with a symetrical condition and it worked well because u are using a RANS model right?? with a...

Forum: FLUENT December 18, 2009, 15:54

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser what are u talking... what are u talking about??????????????????????????????? u are iranian, i am not , and u know nothing in CFD what the hell does the mach number do in an incompressible flow??? How are u planning to...

Forum: FLUENT December 18, 2009, 15:35

Replies: 30 flow over a cylinder 2D Views: 5,155 Posted By thecfduser hi which model are u using??? what do u mean... hi which model are u using??? what do u mean in right answer???? for gigh Re, coherent structures still exist, but u cant see it clearly. U must use a FFT transform to see it.

Showing results 1 to 12 of 12

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