time dependent source term

moloykb · September 6, 2012, 02:42

Dear all,

I am trying to solve the effect of body acceleration on the human arterial system. For that I need to write some codes for a time dependent source term in DEFINE_SOURCE Macros. The acceleration term is given by
a(t) = a0*Cos(omega*t+Phi), where a0 is the amplitude part of the acceleration in mm, but the Fluent document tells that the dimension of the source term should be in N/m^3. How to make the proper dimension for the problem.

Amir · September 6, 2012, 05:57

Dear friend,

Define $\rho a$ as your source term!

Bests,

moloykb · September 6, 2012, 06:37

Dear Amir,
Thanks for your response.Is there is any problem if my source term contains only time as a variable other than any space co ordinate? and in that case dS[eqn]=0, is it correct or not?
N.B: Could you provide me your mail id please for further help...
Thanks in advance

Amir · September 6, 2012, 09:05

Quote:

Originally Posted by moloykb

Dear Amir,
Thanks for your response.Is there is any problem if my source term contains only time as a variable other than any space co ordinate? and in that case dS[eqn]=0, is it correct or not?
N.B: Could you provide me your mail id please for further help...
Thanks in advance

Your defined source term may contain spatial variables or not; these terms may be functions of time or not as well!
But about dS, it's not right. This term prescribes the derivative of the source term respect to the desired variable which you're considering its transport equation. e.g., if you're introducing a source term for x-momentum equation, the dS[eqn] would be 0 if the source is not a function of Ux. It's not about spacial variables. (refer to the UDF manual)

Bests,

September 6, 2012, 02:42	time dependent source term	#1
moloykb Member Dr. Moloy Kumar Banerjee Join Date: Jun 2011 Posts: 71 Rep Power: 14	Dear all, I am trying to solve the effect of body acceleration on the human arterial system. For that I need to write some codes for a time dependent source term in DEFINE_SOURCE Macros. The acceleration term is given by a(t) = a0Cos(omegat+Phi), where a0 is the amplitude part of the acceleration in mm, but the Fluent document tells that the dimension of the source term should be in N/m^3. How to make the proper dimension for the problem.

September 6, 2012, 05:57		#2
Amir Senior Member Amir Join Date: May 2009 Location: Montreal, QC Posts: 735 Blog Entries: 1 Rep Power: 22	Dear friend, Define $\rho a$ as your source term! Bests, __________________ Amir

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September 6, 2012, 06:37		#3
moloykb Member Dr. Moloy Kumar Banerjee Join Date: Jun 2011 Posts: 71 Rep Power: 14	Dear Amir, Thanks for your response.Is there is any problem if my source term contains only time as a variable other than any space co ordinate? and in that case dS[eqn]=0, is it correct or not? N.B: Could you provide me your mail id please for further help... Thanks in advance