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 February 4, 2004, 15:46 rotating propeller - please help - it's urgent #1 cip dany Guest   Posts: n/a hy please it's urgent. if you're having an ideea how can i resolve this case please write to me cause i'm in big problem i'm having a propeller and it's having a speed of 3000 rot/min. the diameter it's 1.372 m and i've modelated half of it. i've done a domain about 30 m after it and 6 before and in its side 20 m. the problem is that i'm not having wright answers concerning speed and pressure and i'm receiving messages like "reversed flow in ... faces and turbulent viscosity limited to viscosity ratio of 1.000000e+05". here it's what i've done i've used moving reference frame with k epsilon turbulence model for the fluid, moving reference frame with 3000 rot/min round x=1 direction for the entrance pressure-inlet gauge pression 0 direction vector x=1, turbulent intensity 1% and hidraulic diameter 0.09604 for the wall stationary wall for the exit pressure outlet with all the options 0 and for k and epsilon also zero. for the other exit (on the half cilinder- the domain) i've used pressure outlet and simmetry for the simmetry plane for under relaxation factord i've used the values recommended in this case in user guide please tell me where i've done wrong cause i have to finish this till sunday and i don'k knew what to do. please cip dany

 February 5, 2004, 02:53 Re: rotating propeller - please help - it's urgent #2 mateus Guest   Posts: n/a Hi! I think you should use periodic bc instead os symmetry... Good luck MATEUS

 February 6, 2004, 05:30 Re: rotating propeller - please help - it's urgent #3 Lukasz Guest   Posts: n/a I'm modelling marine propeller and having the same problem, now I'm trying different meshes with diferent boundary layer sizes, maybe it will work. Mayby you have some e-notes??? I could send you mine.

 February 6, 2004, 13:09 Re: rotating propeller - please help - it's urgent #4 cip dany Guest   Posts: n/a you're right there is an antisymmetry there i've done this model yesterday morning and with the others boundary layers that i've mentioned i steel have wrong values in air.

 February 6, 2004, 13:10 Re: rotating propeller - please help - it's urgent #5 cip dany Guest   Posts: n/a if you're saying to me what are those notes, certenly.

 February 8, 2004, 11:46 Re: rotating propeller - please help - it's urgent #6 cip dany Guest   Posts: n/a i've done the propeller and tomorow i'll see if it's good. send me what you have to modalate there and i'll see how can i help you

 February 11, 2004, 15:50 Re: rotating propeller - please help - it's urgent #7 Lukasz Guest   Posts: n/a Hey, maybe you could send me your mesh file and case file??? it104370@kufel.immt.pwr.wroc.pl TIA Lukasz

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