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-   -   Dynamic Mesh - Compression (http://www.cfd-online.com/Forums/fluent/84364-dynamic-mesh-compression.html)

ZenCef January 27, 2011 03:58

Dynamic Mesh - Compression
 
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Hi guys,

I'm working on a compression problem by using dynamic mesh. I solved my previous problems with CFD Online and now i have a big mistake. Problem scheme is presented in figure1. Pressure inlet condition is 0.5 bar absolute pressure. In valve opens at 45 of crank angle. Cylinder diameter is 25mm and connecting rod length is 47mm. While piston is going to TDC before opening the inlet valve 40 diagramme is could be seen in figure 2 and 3. In pressure diagramme, the compression chambers pressure is -80 bar :eek:. I use pressure based solver and coupled pressure-velocity coupling scheme, standart pressure and default under relaxation factors. -80 bar is impossible so what is my mistake?

Thanks in advance, best regards.

Zencef


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