Sign-up for free online course on ANSYS simulations!Authors: Lara Backer, Cornell University - taken in part from MAE 7340 Analysis of Turbulent Flows and Dr. S. Pope
Problem Specification
1. Pre-Analysis & Start-Up
2. Laminar Setup and Solution
3. Laminar Results
4. Turbulent Setup and Solution
5. Turbulent Results
6. Verification & Validation
Exercises
Comments
Turbulent Jet Setup and Solution
Use the same case and data files as you downloaded in the Laminar setup for the geometry and mesh.
Now, set up the k-ε model for turbulence. In Solution Setup-Models, double click the previous "Viscous-Laminar" option to open the dialogue. Select the "k-epsilon (2eqn)" model for turbulence. Leave the model constants the same as defined in the dialogue below; these values have been refined to constraints of the model and are typically not varied.
The following empirical formulas are useful in defining this model. I is the turbulent intensity,
Unknown macro: {latex}
\large $$d_H$$
is the hydraulic diameter, and d is the jet diameter.
Unknown macro: {latex}
\large
$$
Unknown macro: {I}
= {0.16Re^{-1/8}}
$$
,
Unknown macro: {latex}
\large
$$
Unknown macro: {d_H}
=
Unknown macro: {d}
$$
,
Unknown macro: {latex}
\large
$$
Unknown macro: {l}
=
Unknown macro: {0.07d}
$$
Unknown macro: {latex}
\large
$$
Unknown macro: {epsilon}
= {C_\mu^
Unknown macro: {3/4}
k^
Unknown macro: {3/2}
\over l}
$$
,
Unknown macro: {latex}
\large
$$
Unknown macro: {k}
=
Unknown macro: {3 over 2 (UI)^2}
$$