Values of k and epsilon

SRKR · July 16, 2018, 00:44

Hello all, As a part of my work I am simulating a situation of bubble movement in a static liquid. For that i am using Standard k-epsilon model but, i am unable to fix on the values of k and epsilon. Can some one please tell what values can i take and the reason behind it if any or suggest me a way in which i can get them with reasoning.
Thank you in advance.

LuckyTran · July 16, 2018, 12:59

Maybe I am not familiar with this field but a static liquid shouldn't have any turbulence. Why you are using a turbulence model at all?

SRKR · July 16, 2018, 13:05

Quote:

Originally Posted by LuckyTran

Maybe I am not familiar with this field but a static liquid shouldn't have any turbulence. Why you are using a turbulence model at all?

Bubble movement in static liquid produces turbulence... Something called Bubble induced turbulence..

LuckyTran · July 16, 2018, 19:04

Okay... so... Either way the initial fluid is at rest and completely devoid of turbulence. So the initial values and boundary conditions for k and epsilon should be 0 everywhere.

SRKR · July 17, 2018, 02:41

Quote:

Originally Posted by LuckyTran

Okay... so... Either way the initial fluid is at rest and completely devoid of turbulence. So the initial values and boundary conditions for k and epsilon should be 0 everywhere.

I completely agree with you. But, in the software i am using 'openFOAM', I am unable to initialise with 'k' and 'epsilon' as '0'. Solver is giving error. But, thank you fpr replying.

July 16, 2018, 00:44	Values of k and epsilon	#1
SRKR New Member Srikar Reddy Palla Join Date: May 2018 Posts: 19 Rep Power: 7	Hello all, As a part of my work I am simulating a situation of bubble movement in a static liquid. For that i am using Standard k-epsilon model but, i am unable to fix on the values of k and epsilon. Can some one please tell what values can i take and the reason behind it if any or suggest me a way in which i can get them with reasoning. Thank you in advance.

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July 16, 2018, 12:59		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	Maybe I am not familiar with this field but a static liquid shouldn't have any turbulence. Why you are using a turbulence model at all?

July 16, 2018, 19:04		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	Okay... so... Either way the initial fluid is at rest and completely devoid of turbulence. So the initial values and boundary conditions for k and epsilon should be 0 everywhere.