how can give UDF for mass (m_dot=m0cos(omegat)) for Periodic BC

raj kumar saini · July 30, 2011, 09:21

hello guys !!! do u have any Idea how is it work periodic boundary condition in fluent when we choses UDF for mass (m_dot=m0*cos(omega*t))....

pranab_jha · August 9, 2011, 10:44

DEFINE_PROFILE(pressure,thread,index)
{
real m_dot
real m0 = 5.0 (some value)
real omega
real t=CURRENT_TIME
face_t f;

m_dot = m0*cos(omega*t);
begin_f_loop(f,thread){F_PROFILE(f,thread,index) = m_dot;}end_f_loop(f,thread)
}

Apply this on your pressure boundary. Should work. Read through the UDF manual for fluent. It helps.
http://my.fit.edu/itresources/manual...help/index.htm

July 30, 2011, 09:21	*how can give UDF for mass (m_dot=m0cos(omegat)) for Periodic BC*	#1
raj kumar saini New Member Dr. Raj Kumar Saini Join Date: Apr 2011 Location: Mumbai, India Posts: 23 Rep Power: 15	*hello guys !!! do u have any Idea how is it work periodic boundary condition in fluent when we choses UDF for mass (m_dot=m0cos(omegat))....*

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August 9, 2011, 10:44		#2
pranab_jha Member Pranab N Jha Join Date: Nov 2009 Location: Houston, TX Posts: 86 Rep Power: 16	DEFINE_PROFILE(pressure,thread,index) { real m_dot real m0 = 5.0 (some value) real omega real t=CURRENT_TIME face_t f; m_dot = m0cos(omegat); begin_f_loop(f,thread){F_PROFILE(f,thread,index) = m_dot;}end_f_loop(f,thread) } Apply this on your pressure boundary. Should work. Read through the UDF manual for fluent. It helps. http://my.fit.edu/itresources/manual...help/index.htm

how can give UDF for mass (m_dot=m0*cos(omega*t)) for Periodic BC

how can give UDF for mass (m_dot=m0cos(omegat)) for Periodic BC