Slip condition in pipe flow

whosays · March 4, 2015, 06:47

Hi, I am new to Ansys. I want to apply slip flow condition to my pipe. Have any ideas how to do it?

Thanks

LuckyTran · March 6, 2015, 01:02

In wall boundary conditions, instead of specifying no slip condition you can do a specified shear condition (where you provide the shear with units of Pa). If you want to do more complicated stuff, it might require a UDF.

whosays · March 6, 2015, 15:56

how do you calculate the shear stress? Are there any specific equations?

Thanks for replying btw!

LuckyTran · March 6, 2015, 16:48

You can get it from Newton's Law if you know the velocity.

ImolaSpa · March 6, 2015, 17:31

Or leave at 0 if you are looking to have a full slip condition

March 4, 2015, 06:47	Slip condition in pipe flow	#1
whosays New Member Cheeky monkey Join Date: Mar 2015 Posts: 3 Rep Power: 11	Hi, I am new to Ansys. I want to apply slip flow condition to my pipe. Have any ideas how to do it? Thanks

March 6, 2015, 01:02		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,754 Rep Power: 66	In wall boundary conditions, instead of specifying no slip condition you can do a specified shear condition (where you provide the shear with units of Pa). If you want to do more complicated stuff, it might require a UDF. suga likes this.

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March 6, 2015, 15:56		#3
whosays New Member Cheeky monkey Join Date: Mar 2015 Posts: 3 Rep Power: 11	how do you calculate the shear stress? Are there any specific equations? Thanks for replying btw!

March 6, 2015, 16:48		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,754 Rep Power: 66	You can get it from Newton's Law if you know the velocity.

March 6, 2015, 17:31		#5
ImolaSpa New Member Jacob Join Date: Oct 2014 Location: Washington State Posts: 6 Rep Power: 12	Or leave at 0 if you are looking to have a full slip condition