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Incylinder dynamic mesh with volumetric reaction |
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July 19, 2010, 23:53 |
Incylinder dynamic mesh with volumetric reaction
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#1 |
New Member
Mas
Join Date: Jan 2010
Location: Japan
Posts: 24
Rep Power: 16 |
Hi all,
I'm doing (volumetric reaction) methane-air combustion. I'm using a 3D in-cylinder dynamic mesh with 0.005deg CA / timestep. I set the mesh to update every timestep. The calculation and the ignition start at TDC. For the time being I'm using high temperature patching method to initiate the reaction. I have problem only with the dynamic mesh. The mesh doesn't change when I switched on the volumetric reaction. I have performed several tests to verify this problem: 1. When I switched off the volumetric reaction, the mesh changes accordingly. Piston moving down and the volume increases. 2. When I switched on the volumetric reaction, the reaction occurred accordingly but the mesh doesn't change at all. Piston remains at TDC and volume constant. The figure in this attachment is a cross-section of the combustion chamber at 37.4deg after TDC. The bottom wall is the (should-be-moving) piston with cavity. The volume remains constant as it is at TDC. Am I missing something? Please help. Any thought/comment/advice is appreciated. Thank you.
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<Mas> |
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July 22, 2010, 22:15 |
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#2 |
New Member
Mas
Join Date: Jan 2010
Location: Japan
Posts: 24
Rep Power: 16 |
Bump.
Since there is no answer in this thread, I would like to rephrase my question. Is Fluent capable of calculating 3D incylinder dynamic mesh with volumetric reaction?
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<Mas> |
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March 5, 2011, 06:26 |
Coupling of dynamic mesh and volumetric reaction
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#3 |
New Member
Pang
Join Date: Mar 2011
Location: Denmark
Posts: 25
Rep Power: 15 |
Dear Mas,
I have tested the coupling of dynamic mesh and volumetric reaction. Fluent is capable of calculating 3D incylinder dynamic mesh with volumetric reaction. May I know, 1) what crank period value that you have used? 2) how do you simulate the ignition? |
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March 6, 2011, 22:04 |
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#4 |
New Member
Mas
Join Date: Jan 2010
Location: Japan
Posts: 24
Rep Power: 16 |
Dear kmpang,
Thank you for your reply. FYI, I have abled to solve this problem quite some time ago. My lesson learnt: Fluent cannot re-mesh if the piston displacement is extremely small. This limitation is caused by single precision calc., extremely small time-step/CA, or extremely low piston velocity.
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<Mas> |
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May 3, 2012, 10:22 |
Meshing Internal Combustion Engines Simulation
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#5 |
New Member
MLA
Join Date: May 2012
Posts: 1
Rep Power: 0 |
Hello,
I want mo make an alternative engine combustion simulation using ICEM and FLUENT but i don't know how to make the dynamic mesh using this two softwares. Can you guys help me out? I just need to know how the procedure works, because I am already familiar with meshing process in ICEM. Thanks! |
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Tags |
combustion, dynamic meshing, in-cylinder, reaction |
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