# how to define the motion of ic.engine valves

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 April 4, 2005, 04:34 how to define the motion of ic.engine valves #1 handou Guest   Posts: n/a i am modeling the ic.engine flow. now i can define the pistion motion using the FLUENT build-in function. But, i don't know how to define the motion of valves. The user's guide said"To define the motion of the valves, you need to use profiles that describe the variation of valve lift with crank angle. FLUENT expects certain profile fields to be used to define the lift and the crank angle. For example, consider the following simplified profile definition: ((ex-valve 5 point) (angle 0 180 270 360 720) (lift 0.05 0.05 1.8 0.05 0.05)) ((in-valve 5 point) (angle 0 355 440 540 720) (lift 0.05 0.05 2.0 0.05 0.05))" i want to know where to type this profile. When i try to type it in the command line, it says" error:eval:unbound variable error object:ex-valve" who can help me solve this problem? Thanks!

 April 4, 2005, 05:12 Re: how to define the motion of ic.engine valves #2 daniel Guest   Posts: n/a salut a profile function ((velocity_bassin point 665 1) (time 0.0000000E+00 5.0000002E-04 1.0000000E-03 1.5000000E-03) (v_x 0 1 2) (v_y 1 2 3) ) et tu dois sauver your file *.prof you have to calculate at each time step your velocity values on each axis and create your profile fishier. after you have to read it in define/profiles and after in dinamic mesh to ascociate the motion to your valves ok

 April 4, 2005, 08:23 Re: how to define the motion of ic.engine valves #3 handou Guest   Posts: n/a daniel, thank you very much for your help.

 April 4, 2005, 08:27 Re: how to define the motion of ic.engine valves #4 daniel Guest   Posts: n/a any time ciprian

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