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Help! -User Difined Functions----Drag Coefficient |
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March 13, 2004, 12:10 |
Help! -User Difined Functions----Drag Coefficient
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#1 |
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Hi,
I am using Eulerian Model for multiphase flow. In the model, the drag coefficient is 1.0. And I defined the UDF of Drag coefficient as follows: #include "udf.h" DEFINE_EXCHANGE_PROPERTY(drag, cell, x_thread, s, f) { Cd = 1.0; return Cd; } When the UDF is interpreted, Fluent says "Cd" is an undeclared variable. Even if I declare Cd is a real later, Fluent still showed me the same message. Could someone help me? Thank you. |
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March 14, 2004, 15:04 |
Re: Help! -User Difined Functions----Drag Coeffici
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#2 |
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Cd is a variable, and you must define it *before* you use it.
Usually, it's a good idea to define variables as local, in order to use them only when needed: DEFINE_EXCHANGE_PROPERTY(drag, cell, x_thread, s, f) { real Cd Cd = 1.0; return Cd; } or, easier: DEFINE_EXCHANGE_PROPERTY(drag, cell, x_thread, s, f) { return 1.0; } Hi ap |
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March 14, 2004, 16:41 |
Re: Help! -User Difined Functions----Drag Coeffici
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#3 |
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Thanks AP, I will try as you advised. Colin
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March 14, 2004, 16:52 |
Re: Help! -User Difined Functions----Drag Coeffici
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#4 |
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I forgot a semicolon in this line, in my first function:
real Cd; sorry Hi ap |
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March 15, 2004, 14:10 |
Re: Help! -User Difined Functions----Drag Coeffici
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#5 |
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Hi, ap, they work! Thanks.
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March 15, 2004, 19:04 |
Re: Help! -User Difined Functions----Drag Coeffici
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#6 |
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Great.
Hi ap |
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