Combined erosion (cavitation+silt) problem tubine by ANSYS-CFX..possible?

rakibssu18 · April 19, 2018, 10:43

To all CFX users,
Can CFX simulate the hydroturbine that have 3 phases involved? 1. solid particle . 2. water as continuous phase. 3. water vapor to see the effect of coupled three phases model in turbine.

I am using ANSYS CFX and can simulate two-phase both solid-liquid and liquid-vapor phase but I couldn't find any multiphase models which can be simulated 3 phases model. In CFX, at the same time as treating solid particle with Eulerian model in one simulation??
Actually, I want to check the effect under combined erosion (cavitation+sand/silt).

Thanks you for your reading and suggestion.

ghorrocks · April 19, 2018, 19:06

Yes, CFX can do this. I understand there are some restrictions but I don't know that level of detail. Give it a go and see how it works - and carefully validate and verify your work before using the results.

rakibssu18 · April 19, 2018, 22:24

Thank a lot for your kind reply.

Gert-Jan · April 20, 2018, 04:28

You might be able to use the water-steam-EOS. This allows you to model liquid water and steam as a system in equilibrium. Depending on pressure and temperature, the equilibrium can shift to more steam and less water, or vice versa.
Remember the system assumes equilibrium in each numerical element. As such the mass transfer is assumed infinitely fast, which might be an acceptable assumption in your case.

For water-steam-equilibrium system check Theory guide paragraph 1.2.2.3.4

April 19, 2018, 10:43	Combined erosion (cavitation+silt) problem tubine by ANSYS-CFX..possible?	#1
rakibssu18 New Member Md Rakibuzzaman Join Date: Apr 2018 Posts: 2 Rep Power: 0	To all CFX users, Can CFX simulate the hydroturbine that have 3 phases involved? 1. solid particle . 2. water as continuous phase. 3. water vapor to see the effect of coupled three phases model in turbine. I am using ANSYS CFX and can simulate two-phase both solid-liquid and liquid-vapor phase but I couldn't find any multiphase models which can be simulated 3 phases model. In CFX, at the same time as treating solid particle with Eulerian model in one simulation?? Actually, I want to check the effect under combined erosion (cavitation+sand/silt). Thanks you for your reading and suggestion.

April 19, 2018, 19:06		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Yes, CFX can do this. I understand there are some restrictions but I don't know that level of detail. Give it a go and see how it works - and carefully validate and verify your work before using the results. rakibssu18 likes this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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April 19, 2018, 22:24		#3
rakibssu18 New Member Md Rakibuzzaman Join Date: Apr 2018 Posts: 2 Rep Power: 0	Thank a lot for your kind reply.

April 20, 2018, 04:28		#4
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	You might be able to use the water-steam-EOS. This allows you to model liquid water and steam as a system in equilibrium. Depending on pressure and temperature, the equilibrium can shift to more steam and less water, or vice versa. Remember the system assumes equilibrium in each numerical element. As such the mass transfer is assumed infinitely fast, which might be an acceptable assumption in your case. For water-steam-equilibrium system check Theory guide paragraph 1.2.2.3.4