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

Moving of the mesh

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 16, 2007, 10:08
Default Moving of the mesh
  #1
Diego Augusto
Guest
 
Posts: n/a
Hi I am working with a border problem movel, in the reality is about the one simulation chamber of combustion where I am trying to make the piston if to put into motion a function in accordance with sinoidal, I obtain to inside get movement of mesh of the cylinder however the border movel (piston) don't if puts into motion. What it must make? Debtor!
  Reply With Quote

Old   February 18, 2007, 17:48
Default Re: Moving of the mesh
  #2
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

CFX can model piston/cylinder assemblies. Make the cylinder top a stationary wall, the piston a moving wall with the prescribed motion and the cylinder side walls a wall with unspecified motion.

An important trick to get it to work is to generate the mesh at top dead centre and stretch the mesh out to BDC rather than the other way around. If you squash a BDC mesh to TDC the internal mesh smoothing algorithm has problems with large compression ratioes (eg 10:1) and generates negative volume elements. The mesh smoothing algorithm works well as the mesh is stretched.

Glenn Horrocks
  Reply With Quote

Old   March 26, 2007, 17:41
Default Re: Moving of the mesh
  #3
Diego Augusto
Guest
 
Posts: n/a
Hi

I obtained to make simulations of piston of an engine in the CFX, but I obtained to reach the tax of compression that I need, what I must make so that the piston goes up more? How much to the movement of valve I obtained dislocates them very little, therefore whenever the movement of valve if initiates occurs error in the CFX, what I must make?

Diego Augusto

  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
how to set periodic boundary conditions Ganesh FLUENT 15 November 18, 2020 07:09
[snappyHexMesh] SnappyHexMesh for internal Flow vishwa OpenFOAM Meshing & Mesh Conversion 24 June 27, 2016 09:54
How to let the mesh motion solver just solve a small region near a moving boundary? zhajingjing OpenFOAM Running, Solving & CFD 9 April 28, 2016 05:15
[snappyHexMesh] external flow with snappyHexMesh chelvistero OpenFOAM Meshing & Mesh Conversion 11 January 15, 2010 20:43
Waves halted by moving mesh Piotr Czajko COMSOL 1 November 24, 2007 03:00


All times are GMT -4. The time now is 23:02.