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February 20, 2012, 11:56 |
Segmentation Violation
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#1 |
New Member
Peter
Join Date: Jan 2012
Posts: 29
Rep Power: 14 |
Hello all,
I am currently trying to run a simple simulation on Fluent - a cylinder oscillating in constant velocity field. The udf I am using is - #include"udf.h" /* this function defines velocity of center of gravity for pure plunging motion*/ /* Plunging motion equation is z(t)=h*sin(2*pi*f*t) */ DEFINE_CG_MOTION(plung,dt,vel,omega,time,dtime) { Thread*t; face_t*f; /*reset velocities */ NV_S(vel,=,0.0); NV_S(omega,=,0.0); if(!Data_Valid_P()) return; /* Get the thread pointer for which this motion is defined */ t=DT_THREAD(dt); /* vel[1] is the vertical plunging velocity */ vel[1] = 0.5*sin(time); } The cylinder is of frontal area 1m. The fluid medium is of density 150kg/m3 Viscosity 1kg/m-s 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. Regards, Peter |
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February 21, 2012, 10:20 |
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#2 |
New Member
Peter
Join Date: Jan 2012
Posts: 29
Rep Power: 14 |
Anyone have any ideas?
Thanks again. |
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March 16, 2012, 00:41 |
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#3 |
Member
Join Date: Mar 2011
Posts: 50
Rep Power: 15 |
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.
if 2d: begin_f_loop(f,thread,n) f_node_loop(f,thread,n); if(NODE_POS_NEED_UPDATE(v) NODE_POS_UPDATED(v); vel[0] = 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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