UDF for time-dependent velocity polynomial using VOF model

rahaman · October 26, 2009, 07:40

For 2D water entry problem with VOF model I want to input the following inlet velocity polynomial

v(t)=2.436+3.82t+326.3t2-7255t3+39381t4
0.0<=t<=0.08
I worte the following UDF but it is not working , if possible please help me. I am beginner in writing UDF
#include"udf.h"
DEFINE_PROFILE(unsteady_velocity, thread, position)
{
face_t f;
real t=RP_Get_Real("flow-time")
begin_f_loop(f,thread)
{
F_PROFILE(f,thread,position)=2.436+3.82 *t+ 326.3*pow(t,2)-7255*pow(t,3)+39381*pow(t,4);
}
end_f_loop(f,thread)
}

Thank you very much

t.krishnamohan · October 26, 2009, 08:23

Can you tell about the error you are getting

rahaman · October 26, 2009, 10:14

thank you very much for your reply. actually it does not give any error when i compile it but i am not sure is it ok for my simulation case or not. Do u know what type of boundary condition to need to use for flow separation from sharp corner in case of inviscid model in FLUENT?

Thank you once again for your reply.

lazregenset · July 17, 2014, 10:51

how to calcul A1.A2.A3....
http://jullio.pe.kr/fluent6.1/help/html/ug/node282.htm

im in th big pb .halp me soory and thanks

DevanK · August 29, 2018, 08:56

I have set of polynomial equations which defines the water properties like density, thermal conductivity,dynamic viscosity, specific heat capacity and i want to write UDF for my research work. kindly explain me with example.

Link

https://syeilendrapramuditya.wordpre...ic-properties/)

October 26, 2009, 07:40	UDF for time-dependent velocity polynomial using VOF model	#1
rahaman New Member Rahaman Md. Mashiur Join Date: Apr 2009 Posts: 4 Rep Power: 17	For 2D water entry problem with VOF model I want to input the following inlet velocity polynomial v(t)=2.436+3.82t+326.3t2-7255t3+39381t4 0.0<=t<=0.08 I worte the following UDF but it is not working , if possible please help me. I am beginner in writing UDF #include"udf.h" DEFINE_PROFILE(unsteady_velocity, thread, position) { face_t f; real t=RP_Get_Real("flow-time") begin_f_loop(f,thread) { F_PROFILE(f,thread,position)=2.436+3.82 t+ 326.3pow(t,2)-7255pow(t,3)+39381pow(t,4); } end_f_loop(f,thread) } Thank you very much lazregenset likes this.

July 17, 2014, 10:51	hi im soory .have guive mi your tim	#4
lazregenset New Member lazreg Join Date: Jul 2014 Posts: 9 Rep Power: 12	how to calcul A1.A2.A3.... http://jullio.pe.kr/fluent6.1/help/html/ug/node282.htm im in th big pb .halp me soory and thanks

August 29, 2018, 08:56	How to write UDF for defining the fluid properties???	#5
DevanK New Member Devanarayanan Join Date: Aug 2018 Posts: 3 Rep Power: 8	I have set of polynomial equations which defines the water properties like density, thermal conductivity,dynamic viscosity, specific heat capacity and i want to write UDF for my research work. kindly explain me with example. Linkhttps://syeilendrapramuditya.wordpre...ic-properties/)

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October 26, 2009, 08:23		#2
t.krishnamohan Member Krishna Join Date: Oct 2009 Posts: 34 Rep Power: 17	Can you tell about the error you are getting

October 26, 2009, 10:14		#3
rahaman New Member Rahaman Md. Mashiur Join Date: Apr 2009 Posts: 4 Rep Power: 17	thank you very much for your reply. actually it does not give any error when i compile it but i am not sure is it ok for my simulation case or not. Do u know what type of boundary condition to need to use for flow separation from sharp corner in case of inviscid model in FLUENT? Thank you once again for your reply.