# how to set delta p in fluent ?

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 December 21, 2012, 13:54 how to set delta p in fluent ? #1 Member   ahmad Join Date: Feb 2012 Posts: 97 Rep Power: 6 Hi all .... I want to set a delta P ( P=1.3 Kpa ) , how can i do that in fluent ????

December 22, 2012, 03:07
#2
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Lucky Tran
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Quote:
 Originally Posted by malay Hi all .... I want to set a delta P ( P=1.3 Kpa ) , how can i do that in fluent ????
You must specify the inlet pressure and outlet pressure. Specifying only the pressure difference is not enough to establish all the necessary boundary conditions.

December 22, 2012, 03:10
#3
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Quote:
 Originally Posted by LuckyTran You must specify the inlet pressure and outlet pressure. Specifying only the pressure difference is not enough to establish all the necessary boundary conditions.
thanks for reply .... if i specify the inlet pressure 103 Kpa , and outlet o kpa , what is thw diffrence pressure ? i mean delta p ?

December 22, 2012, 03:14
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Lucky Tran
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Quote:
 Originally Posted by malay thanks for reply .... if i specify the inlet pressure 103 Kpa , and outlet o kpa , what is thw diffrence pressure ? i mean delta p ?
Then your difference in pressure is 103 kPa.

December 22, 2012, 03:15
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Quote:
 Originally Posted by LuckyTran Then your difference in pressure is 103 kPa.
so what about operation pressure ???

December 22, 2012, 03:22
#6
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Lucky Tran
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Quote:
 Originally Posted by malay so what about operation pressure ???
By default, when you specify pressure, it is the gage pressure that is specified. The pressure reference is the operating pressure. By default the operating pressure is 101.325 kPa.

When you specify the pressure to be 103 kPa and 0 kPa you are specifying that the absolute pressure is 103 kPa +101.325 kPa and 0 kPa + 101.325 kPa. For many incompressible flows the operating pressure has no influence.

Hope that helps.

December 22, 2012, 03:24
#7
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Quote:
 Originally Posted by LuckyTran By default, when you specify pressure, it is the gage pressure that is specified. The pressure reference is the operating pressure. By default the operating pressure is 101.325 kPa. When you specify the pressure to be 103 kPa and 0 kPa you specifying that the absolute pressure is 103 kPa +101.325 kPa and 0 kPa + 101.325 kPa. For many incompressible flows the operating pressure has no influence. Hope that helps.
thank you so much .....

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