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Oscillating pressure values (Pulse detonation engine)

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Old   August 6, 2014, 00:01
Default Oscillating pressure values (Pulse detonation engine)
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Min Ngae
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Hello everyone,

I'm trying to simulate a single shot pulse detonation engine with CH4-O2 and have been getting these pressure oscillations behind the reaction wave.

This is meant to be a point discontinuity as seen in the validation results from He and Karagozian, and I suspect it is due to the spatial or time discretization, but I have not been able to resolve this.

Solution method:
Coupled pressure-velocity solver
Least-Squares Cell based (Have tried the other two)
Standard pressure discretization (I've also tried Body Force Weighted and PRESTO!)
3rd order MUSCL for all others
2nd Order Implicit Transient Formulation.
Attached Images
File Type: jpg Boundary conditions.jpg (21.9 KB, 25 views)
File Type: jpg Pressure at 0.15ms.jpg (29.9 KB, 21 views)
File Type: png Validation results at 0.15ms.PNG (16.7 KB, 19 views)
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Old   August 26, 2014, 13:02
Default Help Required in deisgning a PDE
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Hey hi,
We are doing a project on designing a PDE.
Please can you help regarding how a PDE is designed?
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