Define variable temp w.r.t time in fluent

dhananjay · January 14, 2014, 06:07

Hello,
I am trying to simulate defrosting of windshield.
for this I have to give variable temp at inlet of duct as per warm up profile below-

TIME TEMP
0 -8
50 -7
100 -2
150 4
200 8
250 13
300 15
350 17.5
400 19.5
450 22
500 24
550 26
600 27
650 29
700 31
750 33
800 35
850 37
900 39
950 41
1000 43
1050 45
1100 47
1150 49
1200 51
1250 53
1300 55
1350 57
1400 59
1450 61
1500 63
1550 65
1600 66.6
1650 66.6
1700 66.6
1750 66.6
1800 66.6

I have created equation for temp w.r.t time.
Please help me how to write UDF for varying temp at inlet.
Thanks in advance.
Dhananjay.

macfly · January 14, 2014, 12:45

here is an example: http://www.cfd-online.com/Forums/flu...tml#post463127

And please search in the UDF manual before asking questions.

serhan · July 24, 2014, 07:42

Hello dhananjay,

I have the same problem. As your data, temperature is being stable after some time, how do you set your code? For the first part I guess you wrote a polinom. Did you use if statement after 1600 second?

January 14, 2014, 06:07	Define variable temp w.r.t time in fluent	#1
dhananjay New Member dhananjay Join Date: Oct 2012 Posts: 5 Rep Power: 14	Hello, I am trying to simulate defrosting of windshield. for this I have to give variable temp at inlet of duct as per warm up profile below- TIME TEMP 0 -8 50 -7 100 -2 150 4 200 8 250 13 300 15 350 17.5 400 19.5 450 22 500 24 550 26 600 27 650 29 700 31 750 33 800 35 850 37 900 39 950 41 1000 43 1050 45 1100 47 1150 49 1200 51 1250 53 1300 55 1350 57 1400 59 1450 61 1500 63 1550 65 1600 66.6 1650 66.6 1700 66.6 1750 66.6 1800 66.6 I have created equation for temp w.r.t time. Please help me how to write UDF for varying temp at inlet. Thanks in advance. Dhananjay.

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January 14, 2014, 12:45		#2
macfly Senior Member François Grégoire Join Date: Jan 2010 Location: Canada Posts: 392 Rep Power: 17	here is an example: http://www.cfd-online.com/Forums/flu...tml#post463127 And please search in the UDF manual before asking questions.

July 24, 2014, 07:42		#3
serhan New Member Serhan TATAR Join Date: Jul 2014 Posts: 6 Rep Power: 12	Hello dhananjay, I have the same problem. As your data, temperature is being stable after some time, how do you set your code? For the first part I guess you wrote a polinom. Did you use if statement after 1600 second?