CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Buoyancy approach assistance

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   July 8, 2020, 16:25
Default Buoyancy approach assistance
New Member
Righardt Ehlers
Join Date: May 2020
Posts: 2
Rep Power: 0
Ricardo_13 is on a distinguished road
I tried setting up a "simple" buoyancy driven flow problem by simulating the draft through a smoke stack purely as a function of the buoyancy potential.

I would like inputs on my approach.

I am typically considering a vertical pipe (6m) with pressure inlet and outlet (both set at 0Pa g) as my 2 boundary conditions. The pressure inlet is set at 400deg C which fixes the inlet density. The stack wall is adiabatic for now. Density based solver, running steady state with an ideal gas (air) activated.

I am struggling to understand how the specified operating density, which is currently set as 1.225 kg/m3 influences the result. Some literature states that the value is used to stabilize the buoyancy force in low mach number flows, other suggests setting this value to 0, which results in convergence issues, while other states it to be the free stream density.

Any clarity on the specified operating density and my approach in general will be appreciated.

Ricardo_13 is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
production due to buoyancy in turbulence models in openfoam sinatahmooresi OpenFOAM Running, Solving & CFD 8 August 12, 2020 06:01
Euler-Euler and Euler-Lagrangian approach on similar model and comparison Armi Fluent Multiphase 0 June 1, 2016 06:18
buoyancy lift & Buoyancy drag on a moving paddle hhh OpenFOAM 0 July 16, 2013 01:50
Buoyancy Turbulence Chilli83 CFX 3 April 14, 2009 20:28
Buoyancy production for species concentration George Gerber FLUENT 1 May 25, 2006 16:56

All times are GMT -4. The time now is 15:56.