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UDF_Parallel_Programming

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Old   August 25, 2021, 08:13
Default UDF_Parallel_Programming
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Rahul
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Hello everyone,
i did the udf programming before but that was for serial mode. and i'm new to this parallel programming and bit confused about what to solve on host and what on node.
i've written a program for unsteady temperature profile is it correct or what changes should i make further ?
please guide.

/************************************************** ************************************************** ************************************************** ***/

#include "udf.h"


DEFINE_PROFILE(unsteady_temp, thread, position)
{
#if !RP_HOST /* Compile this section for computing processes only (serial
and node) since these variables are not available
on the host */
real x[ND_ND];
face_t f;
real t = CURRENT_TIME;

begin_f_loop(f, thread)
{
F_CENTROID(x,f,thread);
F_PROFILE(f, thread, position) = 6.61e-21*t*t*t*t*t-8.33e-18*t*t*t*t+1.5e-14*t*t*t+3.071e-08*t*t-7.518e-04*t+307.05;
}
end_f_loop(f, thread)
#endif /* !RP_HOST */
}

if i use this same program as above will it work fine for parallel solver?
thanks in advance.
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Old   August 26, 2021, 00:54
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Alexander
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AlexanderZ will become famous soon enoughAlexanderZ will become famous soon enough
this code doesn't require additional directives like #if !RP_HOST to work in parallel,
you may remove it and run your UDF in serial/parallel
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Old   August 26, 2021, 01:03
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Quote:
Originally Posted by AlexanderZ View Post
this code doesn't require additional directives like #if !RP_HOST to work in parallel,
you may remove it and run your UDF in serial/parallel

i tried to compile udf by removing directives but it is throwing this error.

# Generating udf_names.c because of makefile unsteady_temp.C
udf_names.c
# Linking libudf.dll because of makefile user_nt.udf udf_names.obj unsteady_temp.C
Microsoft (R) Incremental Linker Version 14.10.25019.0
Copyright (C) Microsoft Corporation. All rights reserved.

LINK : fatal error LNK1181: cannot open input file 'unsteady_temp.C'
Creating user_nt.udf file for 2ddp_node ...
(system "copy "C:\PROGRA~1\ANSYSI~1\v190\fluent"\fluent19.0.0\sr c\udf\makefile_nt.udf "libudf\win64\2ddp_node\makefile" ")
1 file(s) copied.
(chdir "libudf")(chdir "win64\2ddp_node")# Generating ud_io1.h
unsteady_temp.C
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Old   August 26, 2021, 06:55
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And with serial you did not get this error?
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"The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform" is NOT the error after compiling. It is the error after loading. To see compiler errors, look at your screen after you click "build".
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Old   August 26, 2021, 06:59
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Quote:
Originally Posted by pakk View Post
And with serial you did not get this error?
due to the above mentioned error it was not building the udf library.
Actually previously i tried with interpreting the udf..
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Old   August 26, 2021, 07:01
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Quote:
Originally Posted by rahulmule797@gmail.com View Post
i tried to compile udf by removing directives but it is throwing this error.

# Generating udf_names.c because of makefile unsteady_temp.C
udf_names.c
# Linking libudf.dll because of makefile user_nt.udf udf_names.obj unsteady_temp.C
Microsoft (R) Incremental Linker Version 14.10.25019.0
Copyright (C) Microsoft Corporation. All rights reserved.

LINK : fatal error LNK1181: cannot open input file 'unsteady_temp.C'
Creating user_nt.udf file for 2ddp_node ...
(system "copy "C:\PROGRA~1\ANSYSI~1\v190\fluent"\fluent19.0.0\sr c\udf\makefile_nt.udf "libudf\win64\2ddp_node\makefile" ")
1 file(s) copied.
(chdir "libudf")(chdir "win64\2ddp_node")# Generating ud_io1.h
unsteady_temp.C

/************************************************** ************************************************** *********/
this error is resolved just by renaming UDF from "unsteady_temp.C" to "unsteady_temp.c".
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parallel computing, parallelize udf, temperature profile, udf code

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