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November 2, 2015, 13:08 |
How to engineFoam?
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#1 |
Senior Member
Oskar
Join Date: Nov 2015
Location: Poland
Posts: 184
Rep Power: 11 |
Hello. I would like use engineFoam solver for my own case.
Additional info: CAELinux 2013 64bit I uninstall openfoam211 and install openfoam221 because kivaTest and entire engineFoam solver doesn't work due to well known bug. Salome-meca 6.6 At first I create my own geometry of combustion chamber. Then I mesh it structurally. Centre part is divided cylinder. http://zapodaj.net/images/54bdd39b9c647.png http://zapodaj.net/images/2a97c79365298.png http://zapodaj.net/cda0c3d8f0eef.png.html Dimensions of geometry: Diameter = 38mm Heigh = c.a. 55mm I create groups of faces for liner, piston and cylinderHead and export mesh to unv. (Also I create group of volumes containing all 76500hexahedrons. I don't know if this is necessary? Or maybe I shouldn't create it? ) Then I create my own case folder tree. I run ideasUnvToFoam. Because my geometry is in millimetre I run transformPoints -scale '(0.001 0.001 0.001)' I'm not really sure if I run checkMesh and engineCompRatio as next step. Is it important to solver? Anyway I run them in one of my others attempts. Results: ideasUnvToFoam: http://wklejto.pl/238890 transformPoints: http://wklejto.pl/238891 checkMesh: http://wklejto.pl/238893 engineCompRatio: http://wklejto.pl/238892 Are those results really ok? Ok, Now I edit a little bit files from kivaTest (I based my case on kivaTest). In file engineGeometry I set parameters of conRodLenght, bore, stroke, rpm. I remove clearance because I can't find what it is but it looks like this settings is optional? Anyway I would like to know what it is... In file combustionProperties I set location ignition inside my geometry. In file controlDict I set deltaT to 0.0625. In file boundaries I set type as wall instead of patch. I run engineFoam. It solve my case to -25 CA and then temperature blows up (randomly for example from -3e27 to 3e54). (core dumped) So I decide to edit my case again and start from -25 CA: In file controlDict I set deltaT to 0.001 and startTime -25 In file fvSolution I set nCorrectors to 6 and nonOrthogonalCorrectors to 3 I run engneFoam. It solve my case to -20 CA and then termperature and pressure blows up. Here is end of logfile: http://wklejto.pl/238894 At the end I run checkMesh for -20 geometry: http://wklejto.pl/238895 I wonder if Max aspect ratio = 109.998 is really ok? I hope that somebody could help me a little bit with this. I would like to became openFoam expert some day. Greetings and thanks for reading! sheaker |
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December 4, 2015, 11:35 |
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#2 |
Senior Member
Oskar
Join Date: Nov 2015
Location: Poland
Posts: 184
Rep Power: 11 |
Hello again.
I have learned how to create property mesh and run simulation. Unfortunately there is something wrong with chemistry properties or something like that but it cause in big ignition delay. EGINE: V=500cm3 CR=11.5 ConrodLength=150mm bore=86mm stroke=86mm 2000 RPM spark ignition = -17C.A. isooctane simulation starts from -75C.A with 1bar, 373.15K inlet temperature. Just look at plots of pressure: http://zapodaj.net/images/bc650ada0d3dc.png and temperature: http://zapodaj.net/images/ff5efea252c7f.png What could I do wrong or what can I do to fix it? |
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March 13, 2024, 23:35 |
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#3 |
Member
Guy
Join Date: Jun 2019
Posts: 44
Rep Power: 7 |
Did you ever get this working ?
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