k-e values

Manu Poolakkal · November 2, 2014, 12:01

need the values of "turbulent kinetic energy" and "turbulent dissipation rate" of ammonia vapor and liquid in order to run calculations in fluent. somebody please help me to get the same.

LuckyTran · November 2, 2014, 19:31

Those values are extremely problem dependent. One of the most convenient ways is to compute them from turbulence intensity and length scale. Having gone through literature certainly helps.

Do you need k-e at inlets or as initial conditions?

A popular guess is to use smooth pipe correlations. http://www.cfd-online.com/Wiki/Turbulence_intensity

You can fudge the initial conditions and still eventually get a result. But you can't do that at inlets.

Manu Poolakkal · November 3, 2014, 00:30

thank you sir.i calculated it from turbulent intensity and length scale.

November 2, 2014, 12:01	k-e values	#1
Manu Poolakkal New Member Manu Poolakkal Join Date: Oct 2014 Posts: 12 Rep Power: 11	need the values of "turbulent kinetic energy" and "turbulent dissipation rate" of ammonia vapor and liquid in order to run calculations in fluent. somebody please help me to get the same.

November 2, 2014, 19:31		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,667 Rep Power: 65	Those values are extremely problem dependent. One of the most convenient ways is to compute them from turbulence intensity and length scale. Having gone through literature certainly helps. Do you need k-e at inlets or as initial conditions? A popular guess is to use smooth pipe correlations. http://www.cfd-online.com/Wiki/Turbulence_intensity You can fudge the initial conditions and still eventually get a result. But you can't do that at inlets. Manu Poolakkal likes this.

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November 3, 2014, 00:30		#3
Manu Poolakkal New Member Manu Poolakkal Join Date: Oct 2014 Posts: 12 Rep Power: 11	thank you sir.i calculated it from turbulent intensity and length scale.