I have written a udf for constant slip velocity for the dispersed phase. i have used the interpreted type of udf. but when i hook that udf in the slip velocity panel in interaction panel for two phases, the erro comes saying "Set_Property: null user-defined-function name". this error is coming for some of the simulations only. there was no error when i hooked it to other simulations and i could get the desired results. can anybody help me in this. why this error is coming for some simulations only? thanks in advance.

I had a similar problem. I don't know why, but I bypassed it doing this:

- Open the case file and hook the UDF.

- Save the case file.

- Exit FLUENT

- Open fluent again and reload the case file.

- Set the property in the interaction panel.

Hope this works

Hi

ap

[taufikakbarf]

can anyone solve this problem? i have this problem too. Is my Fluent doesnt installed correctly? or there is a setting to solve this problem? because i dont find any clue in google.

sorry for my bad English

[Mushfiq]

The journal file, the lines which compiles, loads and hooks the udf are marked in red.

/rc /home/mus62929/Bubbler/bub10_4/Bubbler_Validation.cas.h5

/file/auto-save/root-name "/home/mus62929/Bubbler/bub10_4/regular_autosave"

/define/user-defined/compiled-functions compile "libudf03" yes "Only_Modification_Power.c" "" ""

/define/user-defined/compiled-functions load "libudf03"

/define/phases/set-domain-properties/interaction-domain/forces/drag yes tomiyama yes user-defined "modification_factor::libudf03"

/file/auto-save/save-data-file-every "time-step"

/file/auto-save/data-frequency 10

/solve/initialize hyb-initialization

/solve/patch/air ()(air) mp 1

/solve/set/time-step 1e-2

The compilation and loading is working, but the hooking of the udf is not working. The lines are market in red, where the problem can occur.

Copy "/home/mus62929/Bubbler/bub10_4/Only_Modification_Power.c" to "/home/mus62929/libudf03/src"

Working...
# linking to ../../src/Only_Modification_Power.c in lnamd64/3ddp_host
# building library in lnamd64/3ddp_host

# Generating udf_names.c because of makefile Only_Modification_Power.c
# Compiling udf_names.o because of udf_names.c
# Compiling Only_Modification_Power.o because of Only_Modification_Power.c
# Linking libudf.so because of makefile user.udf udf_names.c udf_names.o Only_Modification_Power.o
# linking to ../../src/Only_Modification_Power.c in lnamd64/3ddp_node
# building library in lnamd64/3ddp_node

# Generating udf_names.c because of makefile Only_Modification_Power.c
# Compiling udf_names.o because of udf_names.c
# Compiling Only_Modification_Power.o because of Only_Modification_Power.c
# Linking libudf.so because of makefile user.udf udf_names.c udf_names.o Only_Modification_Power.o

You can also see the 'log'-file in
the working directory for this compilation history

Done.


>
adjoint/ parallel/ server/
define/ parametric-study/ solve/
display/ plot/ surface/
exit preferences/ turbo-workflow/
file/ print-license-usage views/
mesh/ report/

> /define/user-defined/compiled-functions load "libudf03"
hpc2-cn04: Opening library "/home/mus62929/libudf03"...
Done.

hpc2-cn04: Opening library "/home/mus62929/libudf03"...
modification_factor
Done.


>
adjoint/ parallel/ server/
define/ parametric-study/ solve/
display/ plot/ surface/
exit preferences/ turbo-workflow/
file/ print-license-usage views/
mesh/ report/

> /define/phases/set-domain-properties/interaction-domain/forces/drag yes
air-water:
tomiyama no data required.
yes
Drag Factor
air-water:
user-defined no data required.

Error at host: Set_Property: null user-defined-function name
"modification_factor::libudf03"
invalid command ["modification_factor::libudf03"]

Warning: An error or interrupt occurred while reading the journal file.
Some commands may not have been completed.