|August 18, 2013, 07:09||
Calculating Lift/Drag for a boat
Join Date: Feb 2010
Posts: 4Rep Power: 8
I am wondering if someone might be able to point me in the right direction.
I am simulating two-phase flow (air / water) over a (partially submerged) boat. The goal is to calculate the lift and drag forces over the surface.
If I simulated this as single phase (either totally water, or totally air), I get something that I consider as "reasonable".
However, when I combined the two phases, and extracted the lift and drag force, they are (1) not bounded by the corresponding single phase solution and (2) they are off by about two to three orders of magnitude.
I am thinking there might be something with the to the two-phase flow case setup, but I am not sure what that was. Any insights into this problem would be greatly appreciated.
Thanks in advance, Bart.
|August 18, 2013, 18:18||
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,717Rep Power: 99
For a general question I can only give a general answer: http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F
You have not even told us whether the inaccuracy is in lift, drag or both - or if it is too high or low. You need to look at the model closely in the post processor and try to find things which do not appear realistic - they would be the focus of what to do next to improve accuracy.
|drag, lift, two phase|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Questions on dynamicTopoFvMesh||danvica||OpenFOAM Running, Solving & CFD||77||May 13, 2016 04:13|
|Calculating forces on a non-closed surface||ScottN||FLUENT||0||March 1, 2011 18:18|
|Problems in calculating the fluid traction on the current structure frame in 3D models||fw407||OpenFOAM Running, Solving & CFD||0||August 6, 2008 12:04|
|Calculating time||thuy||FLUENT||5||April 10, 2008 04:23|
|How to update polyPatchbs localPoints||liu||OpenFOAM Running, Solving & CFD||6||December 30, 2005 18:27|