|April 28, 2013, 07:26||
Different Drag coefficient
Join Date: Nov 2012
Posts: 6Rep Power: 4
I am trying to study the flow over a circular cylinder.
Simply put, the problem is I get different drag coefficient (and other coefficients as well) with the same Reynolds number,
Of course each time I change the diameter and velocity, but the Reynolds number remains the same, I though it is supposed to get me the same result.
Fluid is air at 20 Celsius, transient flow, 2d, laminar
D= 0.16 u= 0.0095 => Re=100 Drag co. = 0.2323
D= 0.016 u= 0.095 => Re=100 Drag co. = 0.0183
While I find in literatures that this value must be around 1.2
If Reynolds number is not the only determinant factor, how do I validate my data with privious studies, as they just mentiones Reynolds number, not the inlet velocity
Last edited by babak.mahjoub; April 29, 2013 at 09:53.
|April 29, 2013, 07:34||
Join Date: Jun 2011
Posts: 1,097Rep Power: 16
From what I learned from previous threads here, it could be that your domain is too small, i.e. the distance from inlet to cylinder is too small or the distance from cylinder to outlet. Can you post a picture of your domain?
The skeleton ran out of shampoo in the shower.
|circular cylinder, drag coefficients, reynolds number|
|Thread||Thread Starter||Forum||Replies||Last Post|
|problem with saving drag coefficient||colopolo||FLUENT||5||April 12, 2013 10:59|
|Calculation of Drag Coefficient, Help Please||teek22||CFX||1||April 26, 2012 18:41|
|Drag Coefficient Convergence Problem||John||FLUENT||16||September 4, 2009 02:44|
|Drag coefficient for parcels in dieselFoam||sebastian_vogl||OpenFOAM Running, Solving & CFD||5||December 31, 2008 13:19|
|Automotive test case||vinz||OpenFOAM Running, Solving & CFD||98||October 27, 2008 09:43|