CFD Online Logo CFD Online URL
Home > Forums > FLUENT

problem with oscillating cylinder

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

LinkBack Thread Tools Display Modes
Old   December 18, 2006, 05:06
Default problem with oscillating cylinder
Posts: n/a
problem with oscillating cylinder I'm trying to simulate piston oscillating in in cylinder(a compressor). I've met with some problems which i hope someone can help... my problem 2d axisymetric dynamic one. these are the steps i took: 1. Read in the mesh 2. Prepare the udf file given as #include "udf.h"DEFINE_CG_MOTION(vel_comp,dt,vel,omega,time ,dtime){real freq = 34.0;real w = 2.0 * M_PI * freq;real Xcomp = 0.004511;NV_S(vel, = ,0.0);NV_S(omega, = ,0.0);vel[0] = w * Xcomp * cos (w * time)} 3. Compile the source file , its ok. 4. gone to dynamic mesh - zones. Choose the remeshing and smoothing option I've selected piston with rigid body motion with the udf profile just compiled. Cylinder and axis as deforming one. Setted the value as in poppet valve example 5 )in BC condition where to set the velocity of wall (a udf function). ?????? Is it require. ? i am getting negative volume problem. how to solve ? from mesh motion review i got it is not remeshing plz reply ammi

  Reply With Quote


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
benchmark: flow over a circular cylinder goodegg Main CFD Forum 12 January 22, 2013 12:47
Lift Hysteresis problem in Oscillating Airfoil Farid CFX 3 March 29, 2012 05:52
Oscillating cylinder using icoFoam blowing up rieuk OpenFOAM Running, Solving & CFD 5 September 22, 2010 11:25
[Other] Shadow wall region problem amoolraina ANSYS Meshing & Geometry 0 July 25, 2010 21:17
flow around oscillating cylinder gs Main CFD Forum 0 May 31, 2004 06:34

All times are GMT -4. The time now is 08:44.