Alignment error in engine simulation

sangeeth · June 27, 2018, 08:11

1850 WARNING:
there may be an alignment error.
The maximum dot product of the motion vector with a non-moving triangle's normal vector is 1.166965e-03.
For properly aligned moving surfaces, this dot_product should be less than 5.0e-4

1851 WARNING: The boundary type that appears to not be aligned is WALL, and it is attached to boundary 1, which is moving.

The triangle of maximum alignment error is centered at -6.137263e-03 4.243868e-02 -3.186973e-02

Hi

What can be a solution for this error in engine simulation. I tried to project vertices from the piston to head but I cant find any alignment error. I can run the simulation with this error/warning, but when I turn on monitor points the simulation just crashes.

chaighodke · June 29, 2018, 18:55

Can you please let me know what is boundary 1? This error is typically a geometry related issue. I suggest make sure that you are using correct valve axes. Can you please check that.

sangeeth · June 30, 2018, 09:55

Hi Chaitanya

Thank you for the reply. The error was geometry related. The geometry has just a piston and head. I was able to rectify that by projecting the curve from piston to head.

June 27, 2018, 08:11	Alignment error in engine simulation	#1
sangeeth New Member Sangeeth Sanal Join Date: Jul 2015 Posts: 3 Rep Power: 9	1850 WARNING: there may be an alignment error. The maximum dot product of the motion vector with a non-moving triangle's normal vector is 1.166965e-03. For properly aligned moving surfaces, this dot_product should be less than 5.0e-4 1851 WARNING: The boundary type that appears to not be aligned is WALL, and it is attached to boundary 1, which is moving. The triangle of maximum alignment error is centered at -6.137263e-03 4.243868e-02 -3.186973e-02 Hi What can be a solution for this error in engine simulation. I tried to project vertices from the piston to head but I cant find any alignment error. I can run the simulation with this error/warning, but when I turn on monitor points the simulation just crashes.

June 29, 2018, 18:55		#2
chaighodke New Member Chaitanya Ghodke Join Date: May 2017 Location: Convergent Science, Madison WI Posts: 29 Rep Power: 7	Can you please let me know what is boundary 1? This error is typically a geometry related issue. I suggest make sure that you are using correct valve axes. Can you please check that. __________________ --------------------------------------------- Chaitanya D. Ghodke, Ph.D. Senior Research engineer Convergent Science Inc. ---------------------------------------------

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June 30, 2018, 09:55		#3
sangeeth New Member Sangeeth Sanal Join Date: Jul 2015 Posts: 3 Rep Power: 9	Hi Chaitanya Thank you for the reply. The error was geometry related. The geometry has just a piston and head. I was able to rectify that by projecting the curve from piston to head.