Is possible to simulate a vibrating tank in CFX?

lordluan · December 19, 2020, 14:25

I am trying to find If is possible to simulate a reactor (column type) that vibrates unidimensionally in the direction of the axis. Inside of the reactor are pellets of a catalitic material which should react with a upflow gas. My main doubt is about the vibration. Exploring CFX I know that I can create a immersed solid Domain, which does give me an option to simulate the vibration. Is It the right approach?

ghorrocks · December 20, 2020, 02:54

If your tank vibrates with a known motion in a known direction then this is easily modelled as a moving mesh simulation. Do not use immersed solid to do this.

But note that this will have to be a transient simulation using a time step size much smaller than the vibration period. At a guess; 1/20 to most, and possibly 1/100 of the vibration period. This might lead to an impossibly large number of time steps required to model the simulation. If this is the case then you will need to do a separation of variables approach.

lordluan · December 21, 2020, 08:53

Many thanks, sir.

December 19, 2020, 14:25	Is possible to simulate a vibrating tank in CFX?	#1
lordluan Member Lucas Join Date: May 2019 Posts: 41 Rep Power: 7	I am trying to find If is possible to simulate a reactor (column type) that vibrates unidimensionally in the direction of the axis. Inside of the reactor are pellets of a catalitic material which should react with a upflow gas. My main doubt is about the vibration. Exploring CFX I know that I can create a immersed solid Domain, which does give me an option to simulate the vibration. Is It the right approach?

December 20, 2020, 02:54		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,741 Rep Power: 143	If your tank vibrates with a known motion in a known direction then this is easily modelled as a moving mesh simulation. Do not use immersed solid to do this. But note that this will have to be a transient simulation using a time step size much smaller than the vibration period. At a guess; 1/20 to most, and possibly 1/100 of the vibration period. This might lead to an impossibly large number of time steps required to model the simulation. If this is the case then you will need to do a separation of variables approach. lordluan and aero_head like this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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December 21, 2020, 08:53		#3
lordluan Member Lucas Join Date: May 2019 Posts: 41 Rep Power: 7	Many thanks, sir.