Clarksean, R
1991
Direct Numerical Simulation and Visualization of a Three Dimensional Planar Mixing Layer
Clarksean, R. and Ma, K.-L.
AIAA 10th Computational Fluid Dynamics Conference, Honolulu, HI, July 1991. Funded by ACERC.
The coupling of the direct numerical simulation and visualization is useful because of the insight it provides into the development and formation of structures within the flow field. We discuss the use of a volume rendering technique for the visualization of a three-dimensional planar mixing layer. Graphical data in the form of color "snapshots" and a video will be presented to demonstrate the use of the volume rendering method as a better way to understand the physics of turbulent flow.
1990
Direct Numerical Simulation of a Planar Shear Layer Using the Spectral-Compact Finite Difference Technique
Clarksean, R. and McMurtry, P.A.
AIAA Fluid Dynamics, Plasma Dynamics and Lasers Conference, Paper 90-1495, Seattle, Washington, 1990. Funded by ACERC and Environmental Protection Agency.
A numerical algorithm is presented for studying mixing processes in turbulent flows. The approach is a combination of the spectral method and the compact finite difference technique. The compact method is fourth order accurate in space and has good phase error characteristics. In addition, the compact finite difference technique is easily implemented on variable grids. The fourth order accuracy is only degraded to order 2.4 accuracy on large aspect ratio grids (6:1) for the two-dimensional advection equation. The application of this method is illustrated by performing direct numerical simulations of a spatially developing mixing layer. The evolving flow field is visualized by contour plots of vorticity magnitude and the scalar field. These figures show the shedding and pairing of vortices similar to previously conducted experimental work. The three-dimensional results show secondary structures developing, which enhance the mixing process. The structure of the three-dimensional flow field is similar to that observed experimentally, illustrating the ability of this hybrid scheme to accurately simulate the unsteady development of incompressible flows.
Clarksean, R
1991
Direct Numerical Simulation and Visualization of a Three Dimensional Planar Mixing Layer
Clarksean, R. and Ma, K.-L.
AIAA 10th Computational Fluid Dynamics Conference, Honolulu, HI, July 1991. Funded by ACERC.
The coupling of the direct numerical simulation and visualization is useful because of the insight it provides into the development and formation of structures within the flow field. We discuss the use of a volume rendering technique for the visualization of a three-dimensional planar mixing layer. Graphical data in the form of color "snapshots" and a video will be presented to demonstrate the use of the volume rendering method as a better way to understand the physics of turbulent flow.
1990
Direct Numerical Simulation of a Planar Shear Layer Using the Spectral-Compact Finite Difference Technique
Clarksean, R. and McMurtry, P.A.
AIAA Fluid Dynamics, Plasma Dynamics and Lasers Conference, Paper 90-1495, Seattle, Washington, 1990. Funded by ACERC and Environmental Protection Agency.
A numerical algorithm is presented for studying mixing processes in turbulent flows. The approach is a combination of the spectral method and the compact finite difference technique. The compact method is fourth order accurate in space and has good phase error characteristics. In addition, the compact finite difference technique is easily implemented on variable grids. The fourth order accuracy is only degraded to order 2.4 accuracy on large aspect ratio grids (6:1) for the two-dimensional advection equation. The application of this method is illustrated by performing direct numerical simulations of a spatially developing mixing layer. The evolving flow field is visualized by contour plots of vorticity magnitude and the scalar field. These figures show the shedding and pairing of vortices similar to previously conducted experimental work. The three-dimensional results show secondary structures developing, which enhance the mixing process. The structure of the three-dimensional flow field is similar to that observed experimentally, illustrating the ability of this hybrid scheme to accurately simulate the unsteady development of incompressible flows.