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Problems with Meshing of a Rapid Compression Machine |
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July 4, 2014, 07:32 |
Problems with Meshing of a Rapid Compression Machine
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#1 |
Member
Join Date: Apr 2014
Location: N/A
Posts: 47
Rep Power: 12 |
Hello Guys,
I´m working on some simulations on a rapid compression machine. picture 1 is the geometry before the compression, picture 2 geometry after...but in my simulation the piston movement ist bigger! I use Dynamic Mesh with the In-Cylinder-Option (Layering) and a axissymmetric geometry in 2D. Now i have 2 problems: The simulation with my normal mesh works, but Tecplot does not show a boundary layer when i have look at the results. But CFD-Post shows a boundary layer. Why? To avoid this problem i tried to make my mesh finder at the walls (see Attachements). But then i have the problem, that Fluent reports a Negative Volume at the first iteration...I tried some different meshes, but I havent been able to creat a new mesh with a finer boundary layer. Do you have an idea where my problem is? Additionally my interfaces are not working fine. I have some divergences in the temperature contour (attachements). Maybe some of you worked on similar problems and can help me. Looking forward to it Thankyou guys |
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July 10, 2014, 03:40 |
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#2 |
Member
Join Date: Apr 2014
Location: N/A
Posts: 47
Rep Power: 12 |
No suggestions?
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April 19, 2015, 18:48 |
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#3 |
Member
sanjeet Limbu
Join Date: Mar 2015
Posts: 91
Rep Power: 11 |
Hi
I am also making a project in RCM...did the dynamic mesh part . But stuck in the combustion model ... I trying partially premixed for it The mixture fuel is inside the cylinder compressed at 30 millisec. I am able to run the dynamic mesh using the chem kin file for combustion . I got some results... Issues 1. Pressure not rising during the compression stroke 2. tremperature not rising till 30ms and getting raised at instantly- abrupt 3. No combustion happening after it gets to 700K+ temp Pl suggest |
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