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Search: Posts Made By: o_mars_2010
Forum: Main CFD Forum April 29, 2013, 08:35
Replies: 25
Views: 2,890
Posted By o_mars_2010
Actually, now, i am calculating it in my code...

Actually, now, i am calculating it in my code (Immersed Boundary Code).
The drag coefficient is excellently matching the reference data at Re=185
However, the lift coefficient is small around 0.302...
Forum: Main CFD Forum April 28, 2013, 10:33
Replies: 25
Views: 2,890
Posted By o_mars_2010
Thanks a lot for your reply. what about the 2nd...

Thanks a lot for your reply.
what about the 2nd half of my question about tecplot!!
i am using Tecplot to calculate the drag coefficient.
For example: If the Cylinder radius is for example...
Forum: Main CFD Forum April 11, 2013, 06:53
Replies: 25
Views: 2,890
Posted By o_mars_2010
The recirculation length L/D at Re=40 is around...

The recirculation length L/D at Re=40 is around 2, however, from literature i found that it is in the range 2.2~2.4.
Could you please tell me what could be the reason??
(I used different grid size,...
Forum: Main CFD Forum March 18, 2013, 23:42
Replies: 25
Views: 2,890
Posted By o_mars_2010
Dear Dr. Filippo i have some strange results: ...

Dear Dr. Filippo
i have some strange results:
when i set the mesh size to 0.1D, i have a good results for the length of the recirculation zone and the drag coefficient.
l/D=2.33 & Cd=1.55
On the...
Forum: Main CFD Forum February 20, 2013, 11:23
Replies: 25
Views: 2,890
Posted By o_mars_2010
Thank's a lot. :)

Thank's a lot. :)
Forum: Main CFD Forum February 20, 2013, 09:55
Replies: 25
Views: 2,890
Posted By o_mars_2010
x*=x/D, u*=u/U, t*=t.(U/D)

x*=x/D, u*=u/U, t*=t.(U/D)
Forum: Main CFD Forum February 20, 2013, 09:46
Replies: 25
Views: 2,890
Posted By o_mars_2010
So, if i have a rectangular domain of 40D * 30D,...

So, if i have a rectangular domain of 40D * 30D, and a grid size 0.05D
then, the non dimensional diameter will be equal to 1
and the non dimensional inlet velocity will be equal to 1
and the...
Forum: Main CFD Forum February 20, 2013, 09:31
Replies: 25
Views: 2,890
Posted By o_mars_2010
So, how can i specify the inlet velocity...

So, how can i specify the inlet velocity (Dirchilit B.C) on a recatangular domain ?
Forum: Main CFD Forum February 20, 2013, 07:29
Replies: 25
Views: 2,890
Posted By o_mars_2010
Diameter=0.1; % cylinder diameter ...

Diameter=0.1; % cylinder diameter
%kinematicviscosity=1.04e-6; %water at 20 'C
kinematicviscosity=0.01;
ineltvelocity=Re*kinematicviscosity/Diameter;
Forum: Main CFD Forum February 20, 2013, 07:25
Replies: 25
Views: 2,890
Posted By o_mars_2010
I am using the non-dimensional form of N-S...

I am using the non-dimensional form of N-S equation, So i have to set the Reynolds no. and the inlet velocity explicitly, the viscosity does not appear explicitely in the momentum equations.
So,...
Forum: Main CFD Forum February 20, 2013, 03:19
Replies: 25
Views: 2,890
Posted By o_mars_2010
I have a very strange results: When i set the...

I have a very strange results:
When i set the kinematic viscosity as 1.04e-6 i have no recirculation zone.
however, when i set it to 1e-2 i clearly see the recirculation zone.
i calculate the free...
Forum: Main CFD Forum February 19, 2013, 08:31
Replies: 25
Views: 2,890
Posted By o_mars_2010
Thanks a lot for your help. About the stability...

Thanks a lot for your help.
About the stability condition, i think because i am using an implicit way for the treatment of the viscous term then, the restrict constrain of time will be relaxed, so:...
Forum: Main CFD Forum February 19, 2013, 08:19
Replies: 25
Views: 2,890
Posted By o_mars_2010
sorry, i used second order centeral difference...

sorry, i used second order centeral difference for the spatial discretization.
I will repeat what you say from my understanding to it:
So, for example if i want to make a simulation at Re= 40...
Forum: Main CFD Forum February 19, 2013, 05:16
Replies: 25
Views: 2,890
Posted By o_mars_2010
an intersting thing happened when i changed the...

an intersting thing happened when i changed the Re to 500 i could watch a steady state recirculation zone ????

is my inlet velocity has to be adjusted according to the Re ??
I mean
if Re =40...
Forum: Main CFD Forum February 19, 2013, 05:12
Replies: 25
Views: 2,890
Posted By o_mars_2010
i am using AB-CN discretisation on a staggered...

i am using AB-CN discretisation on a staggered grid, the mesh size 0.1D, and a time step of 0.01.
I think i reached the steady state because there is no change in the velocity contours or the...
Forum: Main CFD Forum February 19, 2013, 03:30
Replies: 25
Views: 2,890
Posted By o_mars_2010
No recirculation zone, why??

I have developed a code to simulate a flow past a circular cylinder using Immersed Boundary Method.
I set Re=40, and the free stream inlet velocity to 1 and the diameter of the cylinder 0.1.
The...
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