Validation of FLUENT
 

Dear all...

i just run some cases about fluid flow around cylindrical structure..
how can i know my result valid or not?
how can i know this FLUENT valid?




thank you so much...

Gbu

What type of flow? you may have analytical solution for certain types like laminar or inviscid

i do analytical solution for inviscid flow...
but from simulation the velocity around the pipe = 0..
but in analytical solution the velocity around pipe = 2*U
U = inflow velocity....

i do the simulation based on FLUENT tutorial....

i also do an analytical solution for 1 case from FLUENT tutorial,,,
when i do comparing,,, the result also give a big difference...
especially on the pipe surface..
but when i do comparing above the pipe,,, it gives close result..
is it the limitation of this program?


thx all

Give more information.... and beware of the fact that close to obstacles the velocity lim-s to zero....

inlet velocity= 1 m/s
pipe position in middle of frame...
i also have problem in pressure
also gives a big error (when i comparing to analytical solution)
the analytic solution using superposition of uniform flow+doublet equation...

here i attach velocity contour produce by fluent for my case

I do not see velocity problems.... check Re and see the flow pattern.... How did you calculate that velocity must be 2*U?!?!? and where it must be so (around where)?

the velocity must be 2*U*sin (tetha) in pipe's surface
where tetha is the angle to the center of pipe....
i calculate them from the superposition of uniform flow+doublet flow...


here i attach the picture again with the angle

On the picture you have resultant velocity ( velocity magnitude) and the formula you are looking for "x"... try to show only velocity on x-axis...

i calculate the resultan also in analytical not only in x direction....

i also attach the equation here....
thx before

I am not sure if you can use these equations for all Re range....

mmmmm


oke,,,
i'll try for smaller Re....
i'll ask u later....


thx for helping