Density of multi fluid simulation

unischlaf · September 15, 2011, 10:01

Hi,

I have a multi fluid simulation with CO2 and ideal air. Both fluids are mixed in the simulation.
For a BOS experiment, I want to show the density gradient of the mixture. But I only have two density gradients, one of the CO2 and one of the air. How can I display the total density of both fluids? I mean the density gradient of the mixture.

brunoc · September 15, 2011, 22:18

Create a new variable that calculates the density of the mixture. Then create another varialble that's the grandient of the first variable. Both can be done at the 'Variables' tab on CFD-Post.

bhatiadinesh · September 16, 2011, 01:36

@ Brunoc : Can you create a variable which is a gradient of any existing ( or new ) variable. I had searched for something like earlier, but didn't find it. Please let me know if you know the method.

-Dinesh

brunoc · September 16, 2011, 08:23

Hi Dinesh,

On the Variables tab inside CFD-Post, right-click anywhere to create a new variable. Set its method to 'Gradient' and choose the variable of which you want to know the gradient. That's it.

Cheers.

unischlaf · September 18, 2011, 05:16

Thank you for your answer!

September 15, 2011, 10:01	Density of multi fluid simulation	#1
unischlaf New Member Tobias Join Date: Aug 2011 Posts: 5 Rep Power: 15	Hi, I have a multi fluid simulation with CO2 and ideal air. Both fluids are mixed in the simulation. For a BOS experiment, I want to show the density gradient of the mixture. But I only have two density gradients, one of the CO2 and one of the air. How can I display the total density of both fluids? I mean the density gradient of the mixture.

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September 15, 2011, 22:18		#2
brunoc Senior Member Bruno Join Date: Mar 2009 Location: Brazil Posts: 277 Rep Power: 21	Create a new variable that calculates the density of the mixture. Then create another varialble that's the grandient of the first variable. Both can be done at the 'Variables' tab on CFD-Post.

September 16, 2011, 01:36		#3
bhatiadinesh Member D Join Date: Nov 2010 Posts: 50 Rep Power: 16	@ Brunoc : Can you create a variable which is a gradient of any existing ( or new ) variable. I had searched for something like earlier, but didn't find it. Please let me know if you know the method. -Dinesh

September 16, 2011, 08:23		#4
brunoc Senior Member Bruno Join Date: Mar 2009 Location: Brazil Posts: 277 Rep Power: 21	Hi Dinesh, On the Variables tab inside CFD-Post, right-click anywhere to create a new variable. Set its method to 'Gradient' and choose the variable of which you want to know the gradient. That's it. Cheers.

September 18, 2011, 05:16		#5
unischlaf New Member Tobias Join Date: Aug 2011 Posts: 5 Rep Power: 15	Thank you for your answer!