UDF to simulate car moving, dynamic mesh

costy · December 8, 2013, 05:57

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)
}

shuai_manlou · December 10, 2013, 06:36

#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;
}

costy · December 11, 2013, 05:26

Thank you very much for your help

costy · December 11, 2013, 10:46

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?

December 8, 2013, 05:57	UDF to simulate car moving, dynamic mesh	#1
costy New Member diego Join Date: Sep 2013 Posts: 14 Rep Power: 12	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) }

December 10, 2013, 06:36	copy from the UDF help	#2
shuai_manlou Member CAO Liushuai Join Date: Apr 2012 Posts: 30 Rep Power: 14	#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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December 11, 2013, 05:26		#3
costy New Member diego Join Date: Sep 2013 Posts: 14 Rep Power: 12	Thank you very much for your help

December 11, 2013, 10:46		#4
costy New Member diego Join Date: Sep 2013 Posts: 14 Rep Power: 12	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?