Thermal Gas Expansion of Gas in Cylinder

rahulksoni · February 20, 2017, 01:30

Hello Foamers

I am facing a typical situation to solve in OpenFOAM, I have searched a lot over the internet but couldn't find a similar case or solution.

Lets say, I have cylinder piston arrangement. The Cylinder is filled with some gas and is heated externally. The change in temperature shall cause the change in pressure. I would like to simulate the scenario in possibly two manners:

1. The change in temperature causing the change in pressure. And, if allowed the piston can move under the influence of pressure and friction allowing the pressure to change accordingly. The problem is more or less similar to IC engine with lesser difficulty by not considering internal combustion. Rather, the cylinder is heated by an external source that can be modeled or defined in the simulation.

2. I understand that moving the piston to allow the change in volume may be bit difficult as it may require DyM type of solvers. So, I can ever manage without the piston movement as well. In this case, I can pre-process the mesh for different position of the piston (therefore, different effective volume of the cylinder). Combining results of multiple number of simulation in this manner can even give me the result that are expected from possibility 1.

Can any one please suggest me how to proceed with given situtuation. Which solver would be best. Over, the internet I have found that some people have made custom solver for IC engine simulation with DyM feature. Can those be used for said problem?

Thanks in advance.

nimasam · February 21, 2017, 04:22

you need some pieces of coding
1-add Dynamic mesh to heat transfer solver such as buoyantPimpleFoam or buoyantBoussinqPimpleFoam.

2-calculate the forces insert to walls, you can calculate the force with writing a new boundary condition using groovyBC

robob · August 15, 2017, 03:39

Maybe someone can give more instructions?

Rajaero · August 15, 2017, 04:12

you can do it in Ansys fluid flow-fluent module. i have done the similar case in fluent. once you done a dynamic mesh then you can start set the boundary condition for your model. then you can find out the results which you needed.

robob · August 16, 2017, 08:59

Maybe with sixDoFRigidBodyMotion this should work?

February 20, 2017, 01:30	Thermal Gas Expansion of Gas in Cylinder	#1
rahulksoni Member Rahul Kumar Soni Join Date: Oct 2013 Location: Bhubaneswar, India Posts: 68 Rep Power: 13	Hello Foamers I am facing a typical situation to solve in OpenFOAM, I have searched a lot over the internet but couldn't find a similar case or solution. Lets say, I have cylinder piston arrangement. The Cylinder is filled with some gas and is heated externally. The change in temperature shall cause the change in pressure. I would like to simulate the scenario in possibly two manners: 1. The change in temperature causing the change in pressure. And, if allowed the piston can move under the influence of pressure and friction allowing the pressure to change accordingly. The problem is more or less similar to IC engine with lesser difficulty by not considering internal combustion. Rather, the cylinder is heated by an external source that can be modeled or defined in the simulation. 2. I understand that moving the piston to allow the change in volume may be bit difficult as it may require DyM type of solvers. So, I can ever manage without the piston movement as well. In this case, I can pre-process the mesh for different position of the piston (therefore, different effective volume of the cylinder). Combining results of multiple number of simulation in this manner can even give me the result that are expected from possibility 1. Can any one please suggest me how to proceed with given situtuation. Which solver would be best. Over, the internet I have found that some people have made custom solver for IC engine simulation with DyM feature. Can those be used for said problem? Thanks in advance.

February 21, 2017, 04:22		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,267 Blog Entries: 1 Rep Power: 25	you need some pieces of coding 1-add Dynamic mesh to heat transfer solver such as buoyantPimpleFoam or buoyantBoussinqPimpleFoam. 2-calculate the forces insert to walls, you can calculate the force with writing a new boundary condition using groovyBC __________________ My Personal Website (http://nimasamkhaniani.ir/) Telegram channel (https://t.me/cfd_foam)

August 15, 2017, 03:39	Maybe someone can give more instructions?	#3
robob New Member Join Date: Apr 2016 Posts: 21 Rep Power: 10	Maybe someone can give more instructions?

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August 15, 2017, 04:12		#4
Rajaero Member Taiwan,new north city Join Date: Aug 2017 Location: Taiwan Posts: 74 Rep Power: 9	you can do it in Ansys fluid flow-fluent module. i have done the similar case in fluent. once you done a dynamic mesh then you can start set the boundary condition for your model. then you can find out the results which you needed.

August 16, 2017, 08:59		#5
robob New Member Join Date: Apr 2016 Posts: 21 Rep Power: 10	Maybe with sixDoFRigidBodyMotion this should work?