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February 21, 2006, 05:02 |
oscillating flow
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#1 |
Guest
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hello!
I would like to simulate oscillating flow through a nozzle, and the frequency is very high (approximately 1000-2000Hz). I dont have any experience with that kind of simulations so I would like to know what is the best approach. For instance how do I define velocity inlet with oscillating flow? thanx for, I am sure I will have further questions! BB |
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February 21, 2006, 05:33 |
Re: oscillating flow
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#2 |
Guest
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hi, you have to describe you velocity inlet with a UDF, just like this example (UDF MANUAL) /************************************************** ********************
unsteady.c UDF for specifying a transient velocity profile boundary condition ************************************************** *********************/ #include "udf.h" DEFINE_PROFILE(unsteady_velocity, thread, position) { face_t f; real t = CURRENT_TIME; begin_f_loop(f, thread) { F_PROFILE(f, thread, position) = 20. + 5.0*sin(10.*t); } end_f_loop(f, thread) } |
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February 22, 2006, 02:24 |
Re: oscillating flow
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#3 |
Guest
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With so high frequency, it is better to use a turbulence model...set the mean velocity, and through the amplitude of oscillations you can fix the turbulence intensity....
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