|
[Sponsors] |
velocity profile in a simple cylindrical flow tube |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
December 29, 2016, 21:05 |
velocity profile in a simple cylindrical flow tube
|
#1 |
Senior Member
Join Date: Nov 2015
Posts: 135
Rep Power: 10 |
Hello,
I'm wondering about the velocity profile of a narrow (2cm radius) and long (70cm) flow tube when enabling different turbulence models. Here I have an example of such simulations with the cross-section profile taken after 50cm flow length. The variables are normalized with respect to the tube diameter (therefore xaxis 0-1) and on the y-axis with respect to the plug-flow velocity. The profile expected at "infinity" is the fully developed hagen poisoille 2(1-r^2) (therefore 0-2 on yaxis). Now the solid curve is a semi analytical approach for the velocity profile which fits the laminar solution of ANSYS quite well. However how can - when enabling the turbulence model - vary the profile so much? The first data points are done with k-omega SST, the second k-omega standard low-reynolds, and the third also k-omega standard low-reynold turned off. compressibility effects are turned on, vicious heating as well, production kato-launder and limiter are turned on as well (even though the flow should be incompressible I calculated everything as being compressible, though it shouldnt make a difference). The flow is about 20standard litre per minute at 100hPa and 293K and I expect it to be laminar. |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
InterFoam - Validation for velocity profile in simple channel | me.ouda | OpenFOAM Running, Solving & CFD | 0 | October 19, 2015 06:42 |
Problem with assigned inlet velocity profile as a boundary condition | Ozgur_ | FLUENT | 5 | August 25, 2015 04:58 |
Velocity profile disturbance due to loss coefficient | rks171 | Main CFD Forum | 3 | May 25, 2012 17:30 |
Simple flow into a curved tube problem | andrearimo | OpenFOAM Running, Solving & CFD | 0 | December 22, 2006 04:56 |
Variables Definition in CFX Solver 5.6 | R P | CFX | 2 | October 26, 2004 02:13 |