# regarding dynamics mesh?

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 April 5, 2003, 22:26 regarding dynamics mesh? #1 suki Guest   Posts: n/a HI, I would try to simulate a simple problem before a complecated situation. I saw UDF manual provided by FLUENT.INC., but couldn't understand. My simple situation is that upper wall(rigid body) is moving up and down with a sinusoidal function in a parallel plate. Inlet velocity is given uniformly. No-slip condition is given in lower wall. I found out that there are three types of dynamic mesh define macros,ie DEFINE_CG_MOTION, DEFINE_GEOM, and DEFINE_GRID_MOTION. What type of macros shoud I use for solving the problem? The upper wall is moving as follows: r=r_mean + r_amp*sin(omega*time) r_mean = mean position r_amp= amplitude of postion omega=angula velocity(=1) If you can knw how to set up udf, could you please write it here for me? Your help would be greatly appreciated. Thanks again

 April 6, 2003, 12:55 Re: regarding dynamics mesh? #2 caloggero Guest   Posts: n/a Hi SUKI I'm having the same pb writing UDF for modeling oscillating and rotating NACA-foil movement, which cordinates are: X= R*(1.7*omega*t+sin(omega*t)). Y=R*cos(omega*t). where: R=radius=distance of pivot point (1/3 chord length) to centre of rotation. omega= angular velocity. my first pb is that I didn't get yet the licence and help files for Duynamic mesh, thus I don't know how strong is this utility. my second pb is that I wonder if I can't do that simply with moving wall option with specifying my wall (NACA)velocity coordinates!!!!! at last, what about the sliding mesh option? have you ever tried it? ******************************

 April 6, 2003, 13:10 Re: regarding dynamics mesh? #3 suki Guest   Posts: n/a HI, caloggero Is the dynamic mesh different in idea to sliding mesh? Under my problem, I have to use the first. thanks.

 April 6, 2003, 15:53 Re: regarding dynamics mesh? #4 Alex Munoz Guest   Posts: n/a Hi You can get acccess to Fluent information in the following address http://www.psc.edu/general/software/...f/main_pre.htm perhaps it can help you until you get the accest to fluent support. Regards Alex

 April 7, 2003, 03:49 Re: regarding dynamics mesh? #5 calogero Guest   Posts: n/a thanx Alex, this is really helpful !

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