Computation of turbulent flows in complex geometries by a second-moment closure model
Abstract
The paper presents a computation procedure for turbulent flows by a second-moment closure model. The use of boundary-fitted nonorthogonal grids employing the collocated variable arrangement allows simulations of flows in complex geometries. The discretization of Reynolds stresses appearing in the momentum equations follows a special interpolation technique, ensuring a tight coupling with the mean velocity components via apparent diffusion coefficients. An application has been made to a separating turbulent boundary layer over a curved hill. Although the difference between the second-moment closure and the standard k-epsilon model is not large in calculating the wall shear stress and static pressure variation, the advantage of the second-moment closure is evident in representing detailed turbulent structure in the region of strongly curved mean streamline.
- Publication:
-
5th Numerical Fluid Dynamics Symposium
- Pub Date:
- 1991
- Bibcode:
- 1991nfd..symp..291O
- Keywords:
-
- Closure Law;
- Computational Fluid Dynamics;
- Computational Grids;
- Flow Geometry;
- Reynolds Stress;
- Turbulent Flow;
- K-Epsilon Turbulence Model;
- Shear Stress;
- Turbulent Boundary Layer;
- Fluid Mechanics and Heat Transfer