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UDF to simulate car moving, dynamic mesh

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Old   December 8, 2013, 06:57
Default UDF to simulate car moving, dynamic mesh
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diego
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I've to simulate a car moving along a street. The car velocity mustn't change during the time. Is it correct the following udf?


#include "udf.h"

DEFINE_CG_MOTION(car,dt,vel,omega,time,dtime )
{
Thread *t;
face_t f;
t = DT_THREAD(dt)
vel (10, 0, 0)
omega (0, 0, 0)
}
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Old   December 10, 2013, 07:36
Default copy from the UDF help
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CAO Liushuai
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#include “udf.h”

DEFINE_CG_MOTION(car_velocity,dt,vel,omega,time,dt ime)
{
Thread *t;

NV_S(vel, =, 0.0);
NV_S(omega, =, 0.0);

if(!Data_Valid_P())
return;

vel[0] = 10.0;
}
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Old   December 11, 2013, 06:26
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diego
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Thank you very much for your help
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Old   December 11, 2013, 11:46
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diego
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I've compiled the udf file, but when I click on preview mesh motion and the following error appears:

Updating mesh to time 5.00000e-02 (step = 00001)...
Warning: non-positive volumes exist.
Error: Update-Dynamic-Mesh failed. Negative cell volume detected.
Error Object: #f

How can I resolve the problem?
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