ice Particle tracking

Bookwalker · January 13, 2018, 05:40

Hey

I am still quite new at cfd simulations. However i have to finish an asignment where i simulate the flow of air and ice particles through a tube, with the possibility of the ice particles melting.

My question is how can i get cfx to switch form ice to water particles, at a certain temperature of the particle?

ghorrocks · January 13, 2018, 18:23

That is not a beginner simulation - three phases with phase change. If this is an assignment for beginner CFD operators then whoever set the assignment needs a reality check.

The flow of ice particles in an air flow (ie no water droplets and no phase change) is a difficult simulation for beginner but manageable. Have you successfully modelled this type of a simulation?

But to answer your question - there are several methods of modelling phase change in particles. Are you doing this as a eularian or lagrangian particles? Have a look at the tutorial examples on the ANSYS customer page for examples of how to set them up.

Bookwalker · January 13, 2018, 19:13

I have succesfully simulated the sand particles form the butterfly valve tutorial with my mesh. I am asumming it works the same way for ice particles with different parameters.

I will however talk to my supervisor, if it is possible to run the simulation with just the ice particles.

ghorrocks · January 14, 2018, 18:11

Simply running the simulation is just the first step. You then need to validate and verify it - that is why an apparently simple simulation is complex. So just because you have completed the tutorial and know how to set up a simulation does not mean it will be accurate and give you useable results.

Enough of my soapbox. There are some evaporating particle setups in CFX which may be able to be adapted to melting ice. Have a look in the documentation on the pre-defined setups and tutorial examples in the ANSYS customer webpage.

January 13, 2018, 05:40	ice Particle tracking	#1
Bookwalker New Member Christian Buchgeher Join Date: Dec 2017 Posts: 4 Rep Power: 8	Hey I am still quite new at cfd simulations. However i have to finish an asignment where i simulate the flow of air and ice particles through a tube, with the possibility of the ice particles melting. My question is how can i get cfx to switch form ice to water particles, at a certain temperature of the particle?

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January 13, 2018, 18:23		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	That is not a beginner simulation - three phases with phase change. If this is an assignment for beginner CFD operators then whoever set the assignment needs a reality check. The flow of ice particles in an air flow (ie no water droplets and no phase change) is a difficult simulation for beginner but manageable. Have you successfully modelled this type of a simulation? But to answer your question - there are several methods of modelling phase change in particles. Are you doing this as a eularian or lagrangian particles? Have a look at the tutorial examples on the ANSYS customer page for examples of how to set them up.

January 13, 2018, 19:13		#3
Bookwalker New Member Christian Buchgeher Join Date: Dec 2017 Posts: 4 Rep Power: 8	I have succesfully simulated the sand particles form the butterfly valve tutorial with my mesh. I am asumming it works the same way for ice particles with different parameters. I will however talk to my supervisor, if it is possible to run the simulation with just the ice particles.

January 14, 2018, 18:11		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	Simply running the simulation is just the first step. You then need to validate and verify it - that is why an apparently simple simulation is complex. So just because you have completed the tutorial and know how to set up a simulation does not mean it will be accurate and give you useable results. Enough of my soapbox. There are some evaporating particle setups in CFX which may be able to be adapted to melting ice. Have a look in the documentation on the pre-defined setups and tutorial examples in the ANSYS customer webpage.