{"id":28256,"date":"2017-10-18T14:47:59","date_gmt":"2017-10-18T14:47:59","guid":{"rendered":"\/forum\/forums\/topic\/importing-the-working-torque-into-udf\/"},"modified":"2017-10-18T14:47:59","modified_gmt":"2017-10-18T14:47:59","slug":"importing-the-working-torque-into-udf","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/importing-the-working-torque-into-udf\/","title":{"rendered":"Importing the working torque into UDF"},"content":{"rendered":"

Hallo,<\/p>\n

<\/p>\n

I’m quite new and still learning this program ANSYS 17.2 academic version. I’m trying to simulate a hydrodynamic coupling. It consists of two part, Pump side and Turbine side (A screenshoot of the model is available). The rotational velocity of the pump side is constant. The rotational velocity of the turbine side is changing in respect of time and depends on the value of the working torque (from the fluid to the turbine’s blade).<\/p>\n

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I’ve made a plane on my turbine’s geometry and the working torque (Moment) on the turbine can displyed using ‘monitors’ and ‘reports’.<\/p>\n

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And now I’m going to use this value, so the turbine’s rotational velocity can change in respect of time.<\/p>\n

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1. How can I Import this value into my UDF? Which variable are used in this case?<\/p>\n

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2. And will this UDF File be read in every Iteration? Or will it be just be read once? I dont know if I should put the looping here.<\/p>\n

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3. While I was trying to Interpret my UDF File, this warning came ‘line 23: structure reference not implemented’. Can someone Show\/tell me the mistakes?<\/p>\n

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Here is my UDF File.<\/p>\n

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***********************************************************<\/p>\n

<\/p>\n

#include “udf.h”
#define Niter 25 \/* iteration update interval *\/
#define omg_ts 0.0 \/* starting omega *\/
#define omg_tf 600.0 \/* final omega *\/
#define Jt 0.000554 \/* Moment Inertia of the Turbin*\/<\/p>\n

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 <\/p>\n

<\/p>\n

DEFINE_ADJUST(testudf,d)
{
int zoneID;
int iter = (nres==0)?(1)\"\"(int)count2[nres-1]);
float omgt;
Thread *tc;<\/p>\n

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 <\/p>\n

<\/p>\n

zoneID = 2;
tc = Lookup_Thread(d,zoneID);<\/p>\n

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 <\/p>\n

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if ( (iter%Niter)==0 )
{
del_omgt = Mt\/Jt;
omgt = omg_ts + del_omgt*(iter\/Niter);
if ( omgt > omg_tf ) omgt = omg_tf;
THREAD_VAR(tc).fluid.omega = omgt;
}
}
************************************************************<\/p>\n

<\/p>\n

I’m new and therefore I really appreciate any Reply and any help. Thanks in advance.<\/p>\n

<\/p>\n

Best regards,<\/p>\n

<\/p>\n

Darma Yuda<\/p>\n

<\/p>\n

\"\"<\/p>\n","protected":false},"template":"","class_list":["post-28256","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t