energy imbalance ,Urgent????
Hello all;
How can fluent compute energy imbalance in each cell? Thanks in advance for everybody answer me. Asghari |
Re: energy imbalance ,Urgent????
Hi!
isn't that the energy residual??? Ralf |
Re: energy imbalance ,Urgent????
Thank you;
Ok, But i do'nt know that your definition is really an explanation of energy imbalance based on my definition . I define energy imbalance as follows; Initially , if you consider energy equation according to the following relation(without energy source): { D(rho*E)/DT+div.[ rho *U* (E+p/rho)-div.[k ( grad(T))]=0.0} (k is effective conductivity , rho is density and div indicates to the divergence operator) Then,in any iteration according to the discretization schemes: Energy imbalance = (Unsteady term+ Convection -diffusion)/cell volume ;or; Energy imbalance = [D(rho*E)/DT+(sigma on cell faces) {rho *U.dA* (E+p/rho)}-(sigma on cell faces) { k *grad(T).dA}]/ cell volume ;that dA is cell face vector & U is Velocity vector on the cell face and grad indicates to the gradient vector operator. Is this same energy residual based on your definition?? How can i access to energy imbalance through UDF(or energy residual)? Can you present an UDF that compute upper expression? Please help me. With the best regards. |
Re: energy imbalance ,Urgent????
Hello !
I correct energy imbalance in previous message: Energy imbalance = D(rho*E)/DT+[(sigma on cell faces) {rho *U.dA* (E+p/rho)}-(sigma on cell faces) { k *grad(T).dA}]/ cell volume I finded that residual is equal to a_p*phi_P+sigma (a_nb*phi_nb)-b that (a_nb is cell neighbors coefficients ;a_P is cell coefficient and b is source term). It sounds that Energy imbalance= energy residual/cell volume. Is'nt it ? Also, i wrote a UDF for energy imbalance . Would you like see that part of udf which computes energy imbalance ? It is a c file . would you like i send it for you? Energy imbalance is very great in some cell's. Why ?? Please answer me. I am appreciated for any help. Thanx. |
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