|
[Sponsors] |
Full compressibility treatment vs. Boussinesq buoyancy approximation |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
June 21, 2019, 10:19 |
Full compressibility treatment vs. Boussinesq buoyancy approximation
|
#1 |
New Member
Gavin Ridley
Join Date: Jan 2019
Location: Tennessee, USA
Posts: 25
Rep Power: 7 |
Hi all,
I am dealing with a vertical flow of a gas in a pipe heated from the wall, with bulk temperature differences from the wall around 100 degrees C. I have been using a Boussinesq buoyancy approximation in the setting of incompressible flow for the moment, and have my doubts about the solution since most of the heat transfer solvers in OpenFOAM use a subsonic compressible approach. Does anyone know a rule of thumb for when incompressible approaches with Boussinesq buoyancy terms should be dropped in favor of a subsonic compressible approach? Particularly in terms of highly heated gas. Thanks! |
|
June 21, 2019, 10:47 |
|
#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,777
Rep Power: 71 |
Quote:
The Bousinnesq buoyancy approximation is based on a linear exapnsion, therefore can be used only for small magnitude in the temperature variation. You have such a large difference that a compressible flow model should be required. |
||
March 9, 2020, 05:52 |
|
#3 |
Member
Mingming Zhang
Join Date: Dec 2019
Posts: 35
Rep Power: 6 |
Hi, gridley2, take a look at paper: The validity of the Boussinesq approximation for liquids and gases, Donald D. Gray et al., 1976. Hope it helps.
Mingming |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
How to realize Boussinesq approximation (buoyancy) in Fluent-UDF | dochanxu | FLUENT | 1 | August 12, 2022 05:26 |
InterFoam with boussinesq approximation | sinusmontis | OpenFOAM Running, Solving & CFD | 2 | October 25, 2020 12:21 |
Buoyancy: Boussinesq approximation or temperature dependence? | agustinvo | Main CFD Forum | 5 | September 18, 2015 11:47 |
Natural convection without boussinesq approximation | shahrooz.omd | Main CFD Forum | 0 | June 23, 2015 08:03 |
icoScalarTransportFoam + Buoyancy term (Boussinesq approximation) | will_avoid_comm_solvers | OpenFOAM Programming & Development | 8 | August 22, 2012 08:51 |