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Old   October 27, 2014, 21:16
Default Problem identifying field of profile
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Isaac
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Hi people!

I am a new user in fluent and at the moment I am working on a cfd analysis of an stirling engine, actually I'm defining the motion of the pistons by using a transient profile instead of a UDF. I wrote these profiles first in notepad and saved this with .prof or .ttab extension and read it into fluent. When used the display zone motion and mesh motion dialog box to preview each zone, a message appeared saying Warning: Can't identify any field of profile...
No motion specified.
Is it due to a wrong profile specification, or a wrong center of gravity orientation?

Does anyone know about that?
Thanks in advance
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Old   November 7, 2014, 12:32
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Hi:

You need to have a compiler installed (for example visual studio) and save your code as *.c. Then compile the file in fluent and build the library (see udf manual).
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Old   November 7, 2014, 13:11
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Thanks GK-mech for your Reply

You are talking about DEFINE_PROFILE as a UDF?, I refer to a profile file, I wrote a profile file with the profile format in a transient form and fluent read it, indeed it appeared in the drop down list in the dynamic mesh zone dialog box, I assigned it to a face zone as a rigid body motion in motion attributes.


It is my transient tab profile, may be it has an structure problem or it has a conflict with the center of gravity orientation and location, can you help me with it? thanks in advance.

vinletexp 2 51 1
time u
0.00000 3.77357
0.00100 3.30996
0.00200 2.76185
0.00300 2.14237
0.00400 1.46709
0.00500 0.75342
0.00600 0.01998
0.00700 -0.71397
0.00800 -1.42920
0.00900 -2.10702
0.01000 -2.72995
0.01100 -3.28229
0.01200 -3.75078
0.01300 -4.12517
0.01400 -4.39878
0.01500 -4.56887
0.01600 -4.63681
0.01700 -4.60797
0.01800 -4.49126
0.01900 -4.29830
0.02000 -4.04242
0.02100 -3.73749
0.02200 -3.39685
0.02300 -3.03245
0.02400 -2.65422
0.02500 -2.26983
0.02600 -1.88469
0.02700 -1.50212
0.02800 -1.12368
0.02900 -0.74952
0.03000 -0.37881
0.03100 -0.00999
0.03200 0.35877
0.03300 0.72934
0.03400 1.10328
0.03500 1.48148
0.03600 1.86386
0.03700 2.24893
0.03800 2.63347
0.03900 3.01221
0.04000 3.37760
0.04100 3.71981
0.04200 4.02701
0.04300 4.28591
0.04400 4.48263
0.04500 4.60380
0.04600 4.63766
0.04700 4.57514
0.04800 4.41067
0.04900 4.14264
0.05000 3.77357
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Old   November 7, 2014, 13:17
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I am not really sure how this approach works. I would recommend writing a UDF for the motion (if you know the function).
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