Piston-Type work-exchanger

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  • Last Post 27 February 2019
sppf94 posted this 07 February 2019

I am trying to simulate a piston-type work exchanger (the geometry model is attached). There are 4 valves involved in this process so that the pressure difference between two sides of the cylinder will move the piston back and forth. I could simulate the movement of the piston in two stages: (i) from left to right when LP side is filled by low pressure stream and HP outlet is open so the pressure difference between twe sides of the cylinder will move the piston. Note that the piston is rectangular. (ii) stage two is the movement of the piston from right side to the left....

note that, the pressure difference of the two sides should control the movement of the piston... As soon as I am trying to simulate it in a way that moves the piston back and forth several times I get errors...

I just can simulate the system in two stages : 1 for movement from left to right, and 1 stage for right to left...

 

Any body has any idea about this system and how would it be possible to simulate it? this system is similar to ICE but not 100%.

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kkanade posted this 27 February 2019

you will need to use dynamic mesh - events. 

to check help manual, please see following post. 

https://studentcommunity.ansys.com/thread/how-to-access-the-ansys-online-help/

 

sppf94 posted this 26 February 2019

How can I make the valves open and close during the simulation ?? 

 

kkanade posted this 21 February 2019

You need to use 6dof capability in Fluent as shown in video in previous post. 

if GUI options are not sufficient to you then you will need to use UDF. Please see link below which describes UDF in Fluent. 

Also for more option in 6dof UDF, please see help manual. For accessing help, please check following post. 

https://studentcommunity.ansys.com/thread/how-to-access-the-ansys-online-help/

Also just to let you know as a disclaimer, we cannot help debug client’s UDFs or write UDF. This being said, I'd be happy to provide general recommendations on the syntax. 

 

sppf94 posted this 17 February 2019

 I've attache a preview of the device which has for check valves above. The major challenge is that how to move the piston back and forth several times?

I could not do this with different settings and the device just have a piston, a cylinder and for valves. The question is that is that possible to move the piston back and forth due to pressurization and pressurization? There is nothing to control the movement of the piston except the pressure difference of the two sides of the cylinder. I have seen tutorials but in all there are something such as Crank Angle that controls the movement of the piston.

 

sppf94 posted this 17 February 2019

Here is a imagDevice - Previewe of the device which has for Check Valves that should be open and close for keep moving of the piston back and force...

kkanade posted this 15 February 2019

As ANSYS employees, we can not download attachments. Please insert some zoomed in images of your geometry, mesh and set up. 

Also please look at following tutorial which explains how such kind of systems are modeled. 

 

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