CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Turbulence Viscosity Ratio issue in EXtended domain with Pressure Far Field BCs

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 6, 2018, 16:48
Default Turbulence Viscosity Ratio issue in EXtended domain with Pressure Far Field BCs
  #1
New Member
 
Muneeb
Join Date: Aug 2018
Posts: 14
Rep Power: 4
Muneeb is on a distinguished road
Hi everyone

I am Performing compressible flow analysis in a 30 degree sector of jet engine afterburner.

Details:
Steady state
Flow: Compressible
Turbulence Model: K,E 2 eqn with realizable
BCs: Pressure inlet conditions, pressure Far field condition (at extended domain)
Mesh Size: 5 Million elements (Hexa + Tetrahedral)
Solver: SIMPLE
Mach Number: 0.1 (used in pressure far field Boundary condition)

The solution is easily converged without Extended domain (Extended domain is modeled after Converging diverging duct having pressure far field conditions).

However With extended domain, there comes warning 'Turbulence Viscosity ratio limited to 1e5 in xxxx cells'. This high value of turbulence viscosity ratio is indicated only in Extended domain. It is worthwhile to mention over here that extended domain is meshed with high quality hexahedral element (element size 10 mm). The said error creates problems in convergence. All is well without including extended computational domain. Refer Attached photograph please.

Please suggest the measures I should take in order to curb the issue of high turbulence viscosity in extended computational domain. Thanks in anticipation for your advices.

Regards
Attached Images
File Type: jpg afterburner.jpg (103.8 KB, 3 views)

Last edited by Muneeb; December 6, 2018 at 18:21.
Muneeb is offline   Reply With Quote

Reply

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
Same pressure gradient but different velocity field TurbJet Main CFD Forum 22 April 28, 2018 04:35
Domain Imbalance HMR CFX 5 October 10, 2016 06:57
Waterwheel shaped turbine inside a pipe simulation problem mshahed91 CFX 3 January 10, 2015 12:19
Setting rotating frame of referece. RPFigueiredo CFX 3 October 28, 2014 05:59
Low Mixing time Problem Mavier CFX 5 April 29, 2013 01:00


All times are GMT -4. The time now is 14:11.