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Different force result: DEFINE_Source UDF & without UDF

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Old   November 9, 2017, 14:29
Default Different force result: DEFINE_Source UDF & without UDF
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Hi
I want to see the effect of gravity acceleration. I see different result in these situations:

1.DEFINE_SOURCE UDF
2. Without UDF (by enabling gravity option in FLUENT)


Gravity Force by UDF= 679596.5
Gravity Force without UDF= 658589


Any idea please!



--------------------------------------------------------------
#include "udf.h"
DEFINE_SOURCE(z_mom_source, cell, cell_thread, dS, eqn)
{
real source;

real time=CURRENT_TIME;


source = C_R(cell,cell_thread) *9.81;

dS[eqn] = 0;

return source;
}

--------------------------------------------------------------
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Old   November 11, 2017, 07:22
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This is strange!
please guide me
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