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Pressure wave in exhaust pipe

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Old   December 7, 2018, 02:44
Default Pressure wave in exhaust pipe
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Mario Sanz
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Dear all,

I am simulating an exhaust pipe for a 2 stroke engine in order to see the pressure wave, but I'm struggling with it, since I don't know how to set-up the initial conditions to create such wave.

I have tried stagnation inlet with 60kPa of relative pressure, since in most papers I have seen that it is the peak in pressure produced, but I can't get the wave. I have also tried mass flow inlet with 0.018 kg/s, a value obtained also from papers, with same results, no wave found.

These are my models:
- Three dimensional
- Implicit Unsteady
- Multi-Component Gas (H20, CO2 and N2)
- Ideal Gas
- Coupled Flow
- Coupled Energy
- Turbulent
- k-epsilon

Do you know how to set-up initial conditions to create the pressure wave? In my cases, I can see how pressure increases along the pipe, but as far as I know, the pressure wave should move at speed of sound, which is not what I'm getting.

Thank you very much
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2 stroke, exhaust, exhaust pipe, pressure wave

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