Initial Values for Generate New Turbulence Model Interfaces
A major advantage with the Generate New Turbulence Model Interface feature is that it can express initial values for the new turbulence model in terms of the original model. This makes it possible to first solve a problem using a simple, but robust, turbulence model, such as the k-ε model, and then switch to a more advanced model.
Unless the Initial value from study is not None, the Generate New Turbulence Model Interface initial values for velocity and pressure are taken directly from the solution of the parent model. The initial values of turbulent dependent variables are estimated by using the solution from the selected study:
•
When the parent model is a Laminar Flow model, or when Initial value from study is not None, turbulent dependent variables get their default initial values.
•
Initial values of dependent variables that exist in both the parent model and the generated model are taken directly from the selected study.
•
When the parent model is Turbulent Flow, k-ε or Turbulent Flow, Low Reynolds k-ε and the generated model is Turbulent Flow, k-ω or SST, the initial value for ω is
•
When the parent model is k-ω or SST, and the generated model is k-ε or Low Reynolds k-ε or v2f, the initial value of ε is
•
When the parent model is Algebraic yPlus, and the generated model is k-ε or Low Reynolds k-ε, the initial values of k and ε are:
where and .
•
When the parent model is Algebraic yPlus and the generated model is k-ω or SST, the initial value of k and ω are
where and .
•
When the parent model is L-VEL, and the current model is k-ε or Low Reynolds k-ε, the initial value of k and ε are
where .
•
When the parent model is L-VEL, and the generated model is k-ω and SST, the initial values of k and omega are
•
When the parent model is Spalart-Allmaras and the current model is k-ε or Low Reynolds k-ε, the initial value of k and ε are:
•
When the parent model is Spalart-Allmaras and the generated model is k-ω or SST the initial values of k and ω are
•
When the generated model is Spalart-Allamas turbulent mode, and the parent model any turbulence model but Spalart-Allamas, the initial value of the dependent variable is .