Solving the transient condition

ehsan1986 · October 15, 2012, 06:08

Hi everybody;
I`m working on gas flow between engine cylinder and piston.
I have assumed Combustion chamber pressure as a pressure inlet.
Now,question is,how can I Definition the inlet as a transient?

cfd seeker · October 15, 2012, 12:20

I am not an expert in this but I guess you have to use a UDF for the transient inlet conditions

sadjad.s · October 15, 2012, 16:03

hi mate,
if you want your inlet to change with time, you need to write a udf, which is DEFINE_PROFILE macro.

NormalVector · October 17, 2012, 12:24

You can also define a profile for a transient BC. A profile is essentially a BC Value vs. Time set of data. Fluent linearly interpolates values for flow times that occur in between Time data points you supply.

October 15, 2012, 06:08	Solving the transient condition	#1
ehsan1986 New Member ehsan Join Date: Apr 2012 Location: UK Posts: 14 Rep Power: 14	Hi everybody; I`m working on gas flow between engine cylinder and piston. I have assumed Combustion chamber pressure as a pressure inlet. Now,question is,how can I Definition the inlet as a transient?

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October 15, 2012, 12:20		#2
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	I am not an expert in this but I guess you have to use a UDF for the transient inlet conditions

October 15, 2012, 16:03		#3
sadjad.s Member sadjad Join Date: Jan 2012 Posts: 72 Rep Power: 14	hi mate, if you want your inlet to change with time, you need to write a udf, which is DEFINE_PROFILE macro.

October 17, 2012, 12:24		#4
NormalVector Member NormalVector Join Date: Oct 2010 Posts: 71 Rep Power: 15	You can also define a profile for a transient BC. A profile is essentially a BC Value vs. Time set of data. Fluent linearly interpolates values for flow times that occur in between Time data points you supply.