Axisymmetric geometry

Mechand · February 18, 2019, 08:02

Hello!

I am modelling a reactor using axisymmetric assumption. But since it is only half of the 2D geometry, so my question is, what values of mass flow rate should I specify at the inlet? Should it be the same value as for the 3D real reactor, or somehow modified?

LuckyTran · February 18, 2019, 08:05

For axisymmetric cases you put the entire mass flow rate of the 3D thingy.

http://www.afs.enea.it/project/neptu...g/node1118.htm

Mechand · February 18, 2019, 08:07

I forgot to mention that the reactor has a cylindrical shape

Mechand · February 18, 2019, 08:10

So I don't multiply it by 2*PI, or divide it, just simply the same value as for 3D case.

It's strange because 2D case has completely different results than 3D case. I have no slightest idea what could be the problem. Settings are all the same , geometry is simple 2D rectangular, 3D is a pipe.

LuckyTran · February 18, 2019, 08:10

Yeah.. I edited my post. I gave you the instructions for regular 2D the first time.

Right. Don't divide by 2pi. Put the massflow through the entire 3D inlet. Fluent will divide by 2pi for you.

February 18, 2019, 08:02	Axisymmetric geometry	#1
Mechand New Member Jacob Join Date: May 2018 Posts: 17 Rep Power: 7	Hello! I am modelling a reactor using axisymmetric assumption. But since it is only half of the 2D geometry, so my question is, what values of mass flow rate should I specify at the inlet? Should it be the same value as for the 3D real reactor, or somehow modified?

February 18, 2019, 08:05		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	For axisymmetric cases you put the entire mass flow rate of the 3D thingy. http://www.afs.enea.it/project/neptu...g/node1118.htm Mechand likes this.

February 18, 2019, 08:10		#5
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	Yeah.. I edited my post. I gave you the instructions for regular 2D the first time. Right. Don't divide by 2pi. Put the massflow through the entire 3D inlet. Fluent will divide by 2pi for you. Mechand likes this.

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February 18, 2019, 08:07		#3
Mechand New Member Jacob Join Date: May 2018 Posts: 17 Rep Power: 7	I forgot to mention that the reactor has a cylindrical shape