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some questions about UDFs--------DEFINE_DPM_DRAG

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Old   November 21, 2007, 05:05
Default some questions about UDFs--------DEFINE_DPM_DRAG
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goldenland
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Hi, dear all,

I am trying to modify the drag coefficient of particles in DPM. As known in Fluent, drag coefficient Cd=f(Re_p). I try to modify this as Cd=f(Ma_p,Re_p).

When I do this, I have to use some variables(e.g. T_g, Cp_g) of the cells which the particle currently in. I tried as follows:

DEFINE_DPM_DRAG(henderson, Re, P) {... cell_t c;

c=P_CELL(p);

Thread *t;

t=P_CELL_THREAD(p);

Cp_g=C_CP(c,t); T_g=C_T(c,t); ...}

However, when I compile it in Fluent, there always appereas following messages:

(chdir "libudf")() (chdir "ntx86\2ddp")() henderson.c ..\..\src\henderson.c(9) : warning C4047: '=' : 'struct thread_struct *' differs in levels of indirection from 'int '

# Generating udf_names.c because of makefile henderson.obj udf_names.c

# Linking libudf.dll because of makefile user_nt.udf udf_names.obj henderson.obj

Creating library libudf.lib and object libudf.exp

henderson.obj : error LNK2001: unresolved external symbol _RP_THREAD

henderson.obj : error LNK2001: unresolved external symbol _RP_CELL

libudf.dll : fatal error LNK1120: 2 unresolved externals

Can anyone help me. I don't understand what is the problem. Thanks a lot!
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