|February 23, 2015, 09:46||
Transient udf for limiting flux (solid fuel combustion)
Baradwaj B S
Join Date: Jan 2015
Posts: 75Rep Power: 4
My name is Bharadwaj B S, I am currently doing a project on solid fuel combustion (Single particle). In this I have created a sphere inside a cylindrical fluid domain.
There will be velocity inlet from one side of cylinder and another inlet from the surface of the sphere as mass flux( kg/m^2 s) signifying volatile release.
I have written a simple code where the flux from the sphere is arbitrarily dependent on sphere face temperature (F_T(f, t)). Upto 20 seconds there should be mass flux from the surface of the sphere, when the time reaches 20 seconds the mass flux from surface should stop. For this I have used the if else condition.
From the logic side it seems to be fine. But when I hook and see the result. It is not showing the flux from the surface.
1. Is there any mistake in UDF (macro used, logic or anything)?
2. Can I use CURRENT_TIME in DEFINE_PROFILE?
Because there is a separate macro for transient Profiles. (DEINE_TRANSIENT_PROFILE).
3. Is there any correction in condition (if (time <= 20))??
Please reply at your earliest convenience. Any help will be of great use for me. Thanks in Advance.
int ID = 13;
DEFINE_PROFILE(flux, t, i)
d = Get_Domain(1);
t = Lookup_Thread(d, ID);
flx = 0.0;
tmp = 0.0;
a = - 0.5;
b = 0.0;
time = CURRENT_TIME;
if(time <= 20)
flx = - a * tmp;
tmp = F_T(f, t);
F_PROFILE(f, t, i) = flx;
F_PROFILE(f, t, i) = b;
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