CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Negative Absolute Pressure - Two fluid Model

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 4, 2022, 09:17
Post Negative Absolute Pressure - Two fluid Model
  #1
New Member
 
Neel
Join Date: Nov 2018
Posts: 12
Rep Power: 6
neelcfd is on a distinguished road
I am getting negative absolute pressure when I am including Virtual Mass force using constant coefficient value of 0.5. Due to this negative value, the solver is diverging as the density of dispersed phase is depended on absolute pressure through ideal gas EOS.

Model details :

Solver : ANSYS CFX 14.5
1) One Continuous Phase & One dispersed phase (Compressible Phase)
2) Drag Model - Ishii Zuber, Non Drag forces includes Lift Force, Wall Lubrication Force, Turbulent Dispersion Force through favre averaged drag term.
3) Bubble induced turbulent viscosity - Sato Model

Variable Bubble Diameter is implemented through CEL, as per ideal gas EOS.

Things that I have tried :
1) Reducing pseudo time scale
2) Refining the mesh at inlet & large interface zone (Tetrahedral Unstructured Mesh)
3) Lower value of virtual mass coefficient
neelcfd is offline   Reply With Quote

Reply

Tags
cfx, compressible, euler multiphase, multiphase flow, virtual mass force

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
Wrong multiphase flow at rotating interface Sanyo CFX 14 February 7, 2017 18:19
how to incorporate the temperature of fluid in pressure based cavitation model arindamsantra7 Main CFD Forum 0 September 23, 2014 11:46
[blockMesh] error message with modeling a cube with a hold at the center hsingtzu OpenFOAM Meshing & Mesh Conversion 2 March 14, 2012 10:56
[blockMesh] BlockMesh FOAM warning gaottino OpenFOAM Meshing & Mesh Conversion 7 July 19, 2010 15:11
air bubble is disappear increasing time using vof xujjun CFX 9 June 9, 2009 08:59


All times are GMT -4. The time now is 17:39.