piston doesn't move

shahrbanoo · December 27, 2013, 01:05

Hi dears
I simulated a SI engine for 20 CA. from 380 to 400. when I see the results in .fla file, mean volume in every timestep is the same and the piston doesn't move!
I can see temperature contours in every step without my engine moving!!
what is the reason u think?
I appreciate it if u help me...
I need the answer...

thank you so much...

amin_u50 · December 27, 2013, 11:08

Hi Ms Shahrbanoo
I think you make a mistake in direction of piston motion. X Y Z . First of all see your coordinate of piston and then enter the 1 or -1 for X or Y or Z direction. It is noticeable that 1 or -1 is different. Do you examine piston motion in dummy run? If your dummy run is correct you should not have problem.

Best regards
Amin_u50

shahrbanoo · December 27, 2013, 13:43

Hi Mr Amin
yes, my dummy run works correctly!
in the result, when I see the video that I get from my case, nor the piston, neither the valves move!!
I really don't know what to do

amin_u50 · December 27, 2013, 14:48

Hi...
Really?? I don't know. Ok. I guess your boundary condition doesn't work well. Maybe your problem arises from boundary condition. Check boundary movement

Best regards
Amin_u50

hakim82 · March 18, 2014, 16:20

Hi All
I Just started using AVL Fire I need a help how to create SI engine geometry and mesh.

thanks

December 27, 2013, 01:05	piston doesn't move	#1
shahrbanoo Member shahrbanoo Join Date: Mar 2013 Posts: 63 Rep Power: 6	Hi dears I simulated a SI engine for 20 CA. from 380 to 400. when I see the results in .fla file, mean volume in every timestep is the same and the piston doesn't move! I can see temperature contours in every step without my engine moving!! what is the reason u think? I appreciate it if u help me... I need the answer... thank you so much...

December 27, 2013, 11:08		#2
amin_u50 Member amin u3fi Join Date: Feb 2013 Posts: 63 Rep Power: 6	Hi Ms Shahrbanoo I think you make a mistake in direction of piston motion. X Y Z . First of all see your coordinate of piston and then enter the 1 or -1 for X or Y or Z direction. It is noticeable that 1 or -1 is different. Do you examine piston motion in dummy run? If your dummy run is correct you should not have problem. Best regards Amin_u50 shahrbanoo likes this.

December 27, 2013, 14:48		#4
amin_u50 Member amin u3fi Join Date: Feb 2013 Posts: 63 Rep Power: 6	Hi... Really?? I don't know. Ok. I guess your boundary condition doesn't work well. Maybe your problem arises from boundary condition. Check boundary movement Best regards Amin_u50 shahrbanoo likes this.

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December 27, 2013, 13:43		#3
shahrbanoo Member shahrbanoo Join Date: Mar 2013 Posts: 63 Rep Power: 6	Hi Mr Amin yes, my dummy run works correctly! in the result, when I see the video that I get from my case, nor the piston, neither the valves move!! I really don't know what to do

March 18, 2014, 16:20		#5
hakim82 New Member MO Join Date: Feb 2014 Posts: 1 Rep Power: 0	Hi All I Just started using AVL Fire I need a help how to create SI engine geometry and mesh. thanks