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#1 |
New Member
Join Date: Mar 2016
Posts: 2
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Hi all,
just looking to see if I can get some help with a current simulation I am working on. I am using CFX to model the intake stroke of an internal combustion engine to analyse the effectiveness of an intake port(currently without the valve geometry for simplicity). So far i have managed to apply the mesh motion technique and the simulation runs until the piston is approximately 75 deg ATDC. At this point i encounter the error of negative volume and highly skewed mesh causing the solver to crash. I have kept the geometry and mesh quite basic as firstly i would like to learn the process and setup and then further refine the geometry and mesh. I have applied a pressure inlet at the intake of the port, and used a wall boundary with "parallel to boundary" mesh motion on the piston/cylinder walls. On the top of the piston I have applied a wall boundary with "specified displacement" mesh motion, where the motion of the piston is defined by an expression named "pistondisp" which relates the displacement of the piston to time, which is determined by the time step in the simulation. I have attached some images which i hope will help with my explanation. Any suggestion would be greatly appreciated. Port_and_Chamber_TDC.JPG Port_and_Chamber_MidStrokeJPG.JPG Mesh.JPG setup2.JPG setup1.JPG |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,816
Rep Power: 144 ![]() ![]() ![]() ![]() |
This FAQ has tips and how to debug this problem: http://www.cfd-online.com/Wiki/Ansys..._went_wrong.3F
By the way: my PhD thesis used CFX to model internal combustion engines ![]() |
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#3 |
Member
Saeed Pashazanousi
Join Date: Mar 2020
Location: Iran
Posts: 66
Rep Power: 6 ![]() |
Hi Ghorrocks, I was wondering if you could send your Ph.D. thesis to me (st_s.pashazanousi@urmia.ac.ir). I want to simulate a rotary engine in CFX.
Thanks for your kindness and generosity
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Best regards Saeed Pashazanousi Urmia University Email: st_s.pashazanousi@urmia.ac.ir |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,816
Rep Power: 144 ![]() ![]() ![]() ![]() |
The link I posted 7 years ago is still valid. You can download it from there.
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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#5 |
Member
Saeed Pashazanousi
Join Date: Mar 2020
Location: Iran
Posts: 66
Rep Power: 6 ![]() |
Hi Ghorrocks, Thanks for your quick reply. But the link doesn't work!
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Best regards Saeed Pashazanousi Urmia University Email: st_s.pashazanousi@urmia.ac.ir |
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#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,816
Rep Power: 144 ![]() ![]() ![]() ![]() |
The link works fine for me. I just tested it.
Try another browser. Or try downloading it from another network. Maybe Australia is blocked by Iran or the other way around - in that case try a VPN.
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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