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

Loss of Conservation of mass on a Pressure Corection DNS Solver

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 9, 2010, 10:16
Default Loss of Conservation of mass on a Pressure Corection DNS Solver
  #1
Member
 
Dan
Join Date: Oct 2010
Location: UK
Posts: 41
Rep Power: 6
dandalf is on a distinguished road
Hi I have written a DNS solver for incomressible flow, bassend on a varying resolution cartisean grid.

I programmed it with an object oriented aproach around finite volume grid elements.

When I came to validating my code, I chose to use,

(Schafer et al; 1996) "Benchmark computations of laminar flow around a cylinder". Notes on numerical fluid mechanics 52, 547-566

The first test I chose was the 2D unit circle in a curved fluid velocity profile, and Re = 100

Which should have resuled in a nice von Karman shedding vortex wake,

As the Attached Picture Shows, the solver seems to be converging on a steady state solution, furthermore the flow visualisation clearly shows that local conservation of mass is failing.

The calcualted forces seem so be in the right ball park area, but show no signs of oscillation.

Could anyone sugest any reasons this could be happening,



Dandalf
Attached Images
File Type: jpg LosOfMass.jpg (42.5 KB, 6 views)
dandalf is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pulsatile pressure inlet with pressure outlet a.lynchy FLUENT 3 March 23, 2012 14:45
Pressure BC for combustion chamber Giuki FLUENT 1 July 19, 2011 11:35
Domain Reference Pressure and mass flow inlet boundary AdidaKK CFX 12 February 11, 2010 21:28
DNS Mass conservation aslekay Main CFD Forum 0 November 17, 2009 21:47
Loss of mass Pascale Fonteijn CFX 8 April 23, 2003 15:59


All times are GMT -4. The time now is 00:12.