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

Unphysical velocity, rotating frame(dbns-> Roe Flux ->Venkatakrishnan limiter)

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 21, 2019, 01:27
Default Unphysical velocity, rotating frame(dbns-> Roe Flux ->Venkatakrishnan limiter)
  #1
Member
 
Bidesh Sengupta
Join Date: Sep 2018
Posts: 68
Rep Power: 4
BSengupta is on a distinguished road
Hi !!


I am giving my checkMesh results with some images of the mesh. Overall domain bounding box (-2.500042546 -2.500042549 -2.5) (2.500042479 2.500042481 2.5)
Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
Mesh has 3 solution (non-empty) directions (1 1 1)
Boundary openness (-1.694856469e-17 3.009640066e-17 -7.821753458e-16) OK.
Max cell openness = 3.744188186e-16 OK.
Max aspect ratio = 5.877757993 OK.
Minimum face area = 5.278152888e-08. Maximum face area = 0.0101113708. Face area magnitudes OK.
Min volume = 5.7498987e-10. Max volume = 0.001010488176. Total volume = 124.2733063. Cell volumes OK.
Mesh non-orthogonality Max: 61.89625939 average: 4.76190501
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 3.872508738 OK.
Coupled point location match (average 0) OK.
Mesh OK.


With this mesh when I am running the simulation (dbns-> Roe Flux ->Venkatakrishnan limiter) with blade rpm of 1250, the maximum velocity is becoming too high. Can skewness be the cause of the unphysical simulation? The radius of the blade is 1.48m, NACA 0012 and pitch angle is 8deg.


Is it possible to find the most affected cells in paraview?
Attached Images
File Type: jpg Fig2.jpg (191.1 KB, 13 views)
File Type: jpg Fig3.jpg (200.6 KB, 14 views)
File Type: jpg Fig4.jpg (194.2 KB, 12 views)
BSengupta is offline   Reply With Quote

Old   November 28, 2019, 02:44
Default
  #2
Member
 
Bidesh Sengupta
Join Date: Sep 2018
Posts: 68
Rep Power: 4
BSengupta is on a distinguished road
Any help please.
BSengupta is offline   Reply With Quote

Reply

Tags
dbns, foam extend, openfoam, rotating blade, snappy hex mesh

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
Radiation in semi-transparent media with surface-to-surface model? mpeppels CFX 11 August 22, 2019 07:30
Multiphase flow - incorrect velocity on inlet Mike_Tom CFX 6 September 29, 2016 01:27
Car external aerodynamic with wheel spinning issue hokhay FloEFD, FloWorks & FloTHERM 2 August 18, 2016 04:23
VELOCITY vs VELOCITY IN STN FRAME vs RELATIVE VELOCITY everest20 FLUENT 1 July 13, 2015 08:35
Variables Definition in CFX Solver 5.6 R P CFX 2 October 26, 2004 02:13


All times are GMT -4. The time now is 04:24.