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Scheme file for sinusoidal channel flow

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Old   November 24, 2009, 10:27
Default Scheme file for sinusoidal channel flow
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I am trying to model flow through a channel, Womersley number one, with a sinusoidal pressure gradient. I saw elsewhere on this forum that using a udf with a scheme file to implement it at each timestep is the way forward, though I am having trouble programming the scheme file.

This is the udf and scheme file I started with..


#include "udf.h"

real pressure, t;
pressure=sin(t);; /* The pressure gradient can be a function of time. */
RP_Set_Real("flag", pressure); /* This will store the pressure gradient value in a variable called flag*/

scheme file...

(rp-var-define 'flag 0 'real #f)
(define print
(define nu (rpgetvar 'flag))
(rpsetvar 'periodic/pressure-derivative nu)

Any help would be much appreciated

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