Boundary condition for charge-air-cooler
Hello,
I got a case where I got a liquid cold charge air cooler. The incoming air has a massflow of 0.15 kg/s with a temperature of 150°C and Pressure of 2.2 atmosphere.
How do I set this BC in simlab? Looking on the BC for massflow, then I can set temperature and massflow...but not pressure.
How do I do with the material-database?
I have air, but do I make a new material, called AIR-2 or something...and change density to pointwise-linear and write in a density table as function of temperature? Or can Simlab handle this automatically?
Best Answer
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Hello Torbern,
I believe it is possible to achieve your requirements using Advanced BC. Let me suggest you doing the following:
1. Define the Inlet as Pressure. You can set pressure and temperature in this panel.
2. Create an Advanced BC, surface integrated for Mass Flux.
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Answers
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Hello Torbern,
I believe it is possible to achieve your requirements using Advanced BC. Let me suggest you doing the following:
1. Define the Inlet as Pressure. You can set pressure and temperature in this panel.
2. Create an Advanced BC, surface integrated for Mass Flux.
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You would not specify both velocity/flow rate and pressure at the inlet. That would over-specify the condition.
At the outlet you would specify the pressure. If you specify the inlet pressure, the velocity/flow-rate is the unknown and solved. If you specify the inlet velocity/flow-rate, the pressure is the unknown and solved.
Ideal-Gas density is a function of absolute pressure and absolute pressure. If you want density a function of absolute temperature only, you could do that with piecewise-linear density and define the density-temperature pairs.
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