[reza67]

hi everyone

the kasuda equation shown below :




where Z is the ground depth (in meter) and Ƭ is the time ( in day)
other parameters is given

does anyone write this udf before in fluent or can help me to define it in fluent ?

[pakk]

Steps to do this:

1. Find out how to set a simple temperature profile, such as T(Z,tau)=Z+tau. It does not have to make physical sense, but just to make sure you understand how to put this in Fluent. For this, look in the Fluent help, there must be examples.

2. Change Z+tau to the Kasuda equation. That would look like: (typo's might still be present)

T_g+A_Gs*exp(-Z*sqrt(M_PI/365/alpha_s))*cos(2*M_PI/365*(tau-tau_0-Z/2*sqrt(365/M_PI/alpha_s)))

Good luck!

[reza67]

Originally Posted by pakk

Steps to do this:

1. Find out how to set a simple temperature profile, such as T(Z,tau)=Z+tau. It does not have to make physical sense, but just to make sure you understand how to put this in Fluent. For this, look in the Fluent help, there must be examples.

2. Change Z+tau to the Kasuda equation. That would look like: (typo's might still be present)

T_g+A_Gs*exp(-Z*sqrt(M_PI/365/alpha_s))*cos(2*M_PI/365*(tau-tau_0-Z/2*sqrt(365/M_PI/alpha_s)))

Good luck!

thanks pakk
i never work with fluent's udf before
do you have any examples like T(Z,tau)=Z+tau to learn how to write it ?

[pakk]

Did you already look for it in the Fluent help?

[reza67]

Originally Posted by pakk

Did you already look for it in the Fluent help?

i looked but i dont know how should i start to learning udf