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

Mass loss/change help when cylinder shrink?

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 20, 2007, 00:12
Default Mass loss/change help when cylinder shrink?
  #1
CF
Guest
 
Posts: n/a
Hi,

I'm using a 2d NS fractional step code to simulate flow past a cylinder. I'm using an o-grid. In the computational scheme, there is no special mass correction required.

Supposed after some time the cylinder will deform/morph/shrink into a smaller cylinder slowly until the radius is now half the original, do I need to do any special correction computation since the mass of cylinder is now smaller?

Btw, the shrinking cylinder is modelled using deforming grid. However, the overall computational domain size remains the same. Thank you.
  Reply With Quote

Old   November 20, 2007, 09:56
Default Re: Mass loss/change help when cylinder shrink?
  #2
ag
Guest
 
Posts: n/a
You will need to ensure that geometric conservation is preserved. The original paper is an AIAA paper by Thomas and Lombard. Try googling geometric conservation.
  Reply With Quote

Old   November 20, 2007, 13:55
Default Re: Mass loss/change help when cylinder shrink?
  #3
CF
Guest
 
Posts: n/a
Thanks ag. I'm aware of geometric conservation. What I am more interested in is whether there are other things which I need to consider as a result of change of mass/volume of the body.

There shouldn't be, right?
  Reply With Quote

Old   November 20, 2007, 14:08
Default Re: Mass loss/change help when cylinder shrink?
  #4
ag
Guest
 
Posts: n/a
As long as you account for the grid volume changes via geometric conservation and you have accounted for the grid motion in the construction of the flux terms then you should be OK.
  Reply With Quote

Reply


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
mass flow in is not equal to mass flow out saii CFX 12 March 19, 2018 06:21
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Calculating Sloshing mass in a cylinder satellite_control FLOW-3D 0 June 20, 2011 06:34
Added Mass in a 2-D Cylinder Rahul Bharadwaj Main CFD Forum 0 March 2, 2005 14:11
Added Mass in a 2-D Cylinder Rahul Bharadwaj FLUENT 0 March 2, 2005 13:51


All times are GMT -4. The time now is 02:49.