|September 10, 2013, 02:56||
udf and uds for transport equation
Join Date: Mar 2013
Posts: 3Rep Power: 5
Hello, every body
My geometry is a 2D suqare enclosure and the fluid fill of inside is Al2O3-Water.
This case is a natural convection and consider the transport equation include the brownian motion and thermophoresis mechanism.
Because i don't have enough experiences to validation the nanoparticle rayleigh number and nusselt number.
should i click the multiphase or discrete phase in models ?
Can any one can help me to solve it. thanks
the transport equation source is u*(Partial phi/Partial x) + v*(Partial phi/Partial y) =[(Partial/Partial x)*(DB*Partial phi/Partial x)+(Partial/Partial y)*(DB*Partial phi/Partial y]+[(Partial/Partial x)*(DT*Partial T/Partial x)+(Partial/Partial y)*(DT*Partial T/Partial y]
DB is brownian motion&DT is thermophoresis coefficient
by the way this is my code(the transport equation source term)困惑：
real D_T /* thermophoresis coefficient */
real S_T; /* thermophoresis parameter */
real mu_f; /* water of dynamic viscosity Unit: kg/m-s */
real rho_f; /* water of density Unit: kg/m^3 */
real T; /* Temperatur of cold wall Unit: kelvin scale */
real phi; /* nanoparticle volume fraction */
S_T = 0.13; mu_f = 0.00063544; rho_f = 991.8; T = 313; phi = 0.01;
C_T_G(c,t); /* returns the x-component of the cell temperature gradient vector */
D_T = S_T*(mu_f/(rho_f*T))*phi;
C_T_G(c,t,i)= c_t_g(c,t,i)/dx +
ds[equ] = D_T*C_UDSI(c,t,0);
|September 15, 2015, 01:02||
Join Date: Nov 2014
Posts: 42Rep Power: 4
I want to use one user defined scalar for transport equation (for volume fraction of nano particle),
I set in fluent but I dont know how I specified that scalar quantity is volume fraction?
I would appreciate if you can help me.
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