|February 20, 2012, 12:56||
Join Date: Jan 2012
Posts: 29Rep Power: 7
I am currently trying to run a simple simulation on Fluent - a cylinder oscillating in constant velocity field. The udf I am using is -
/* this function defines velocity of center of gravity for pure plunging motion*/
/* Plunging motion equation is z(t)=h*sin(2*pi*f*t) */
/*reset velocities */
/* Get the thread pointer for which this motion is defined */
/* vel is the vertical plunging velocity */
vel = 0.5*sin(time);
The cylinder is of frontal area 1m.
The fluid medium is of density 150kg/m3
I have checked mesh, it runs with the cylinder oscillating and produces no errors.
When I run the code, with the cylinder in constant velocity I get the following error -
Updating solution at time level N... done.
Updating mesh at time level N... done.
iter continuity x-velocity y-velocity time/iter
No error handler available
Error: FLUENT received a fatal signal (SEGMENTATION VIOLATION).
Error Object: ()
If anyone can advise of a solution or something for me to try I would be extremely grateful.
|March 16, 2012, 01:41||
Join Date: Mar 2011
Posts: 50Rep Power: 8
there are several problems in this udf. I will address one critical one. You are using a grid motion udf and you have written equation in terms of the nodes of the mesh.
vel = NODE_Y(v)*sin(2*pi*time);
for time you need to get flow time. there is a macro for that.
If your thread were a straight line of nodes, I am moving the nodes in sinusoidal form .
Therr are other problems in udf. I am busy. Hope this helps.
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