Turbulent Prandtl Number

HobbsTunaSandwich · March 24, 2016, 06:21

Hi Everyone,

I'm supposed to simulate the turbulent distribution of self-heating (radioactive) particles in a liquid sodium pool.

To this end I had to define the material properties of liquid sodium under Continua => Physics 1 => Models => Liquid
among them the Turbulent Prandtl Number. I used the correlation of Jischa and Rielke for Liquid Metals, defined the Turbulent Prandtl Number to be controlled by a field function and set up:

$Pr_t=0.9+\frac{182.4}{Pr*Re^{0.888}}$

For the Reynoldsnumber Re, I inserted the ParticleReynoldsNumber field function available from Star-CCM. For the Prandtl Number I used a temperature dependent correlation (also defined as field function).

My problem is that when I'm trying to start the computation the code throws an error:

"Field function "TurbulentPrandtlNumber" cannot be evaluated on cells of Region 1"

Is this because my injectors have not yet started to discharge particles into the sodium pool and there is no ParticleReynoldsNumber yet? If so is there a way around this? Any other reason you guys can think of?

Thank you for your time and effort.

fluid23 · March 24, 2016, 15:17

Can you share the field function definition you entered?

Also, how are you initializing your flow?

March 24, 2016, 06:21	Turbulent Prandtl Number	#1
HobbsTunaSandwich New Member Join Date: Jul 2015 Posts: 3 Rep Power: 10	Hi Everyone, I'm supposed to simulate the turbulent distribution of self-heating (radioactive) particles in a liquid sodium pool. To this end I had to define the material properties of liquid sodium under Continua => Physics 1 => Models => Liquid among them the Turbulent Prandtl Number. I used the correlation of Jischa and Rielke for Liquid Metals, defined the Turbulent Prandtl Number to be controlled by a field function and set up: $Pr_t=0.9+\frac{182.4}{Pr*Re^{0.888}}$ For the Reynoldsnumber Re, I inserted the ParticleReynoldsNumber field function available from Star-CCM. For the Prandtl Number I used a temperature dependent correlation (also defined as field function). My problem is that when I'm trying to start the computation the code throws an error: "Field function "TurbulentPrandtlNumber" cannot be evaluated on cells of Region 1" Is this because my injectors have not yet started to discharge particles into the sodium pool and there is no ParticleReynoldsNumber yet? If so is there a way around this? Any other reason you guys can think of? Thank you for your time and effort.

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March 24, 2016, 15:17		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	Can you share the field function definition you entered? Also, how are you initializing your flow?