Weakly compressible flow model and simulations of vortex-shedding flows about a circular cylinder
The model for weakly compressible flow was studied, showing its capability of simulating unsteady and steady flows. It was illustrated that model efficiency can be increased by properly reducing the sound speed, when unsteady flow is simulated. When steady flow is modeled, the convergence can be accelerated by two ways, reducing the sound speed and applying the boundary control. A new model is developed for the simulation of unsteady separated flow at high Reynolds number, and the two-dimensional modeled results are in good agreement with the measured data of vortex-shedding flows about a stationary circular cylinder in the sub- and super-critical regimes. This model is based on solving the weakly-compressible-flow equations of primitive variables, with the viscous layer on the cylinder surface being approximate by applying the hybrid type of boundary conditions including no-slip, partial-slip and full-slip conditions, and the diffusive effect of small-scale turbulences begin considered by using a subgrid model. It was also shown that inviscid separation is caused by the capture of vorticity source at flow boundary, and the inertial effect and the impossibility to numerically resolve the flow around a sharp corner are actually responsible for the generation of a vorticity source around the corner.
- Research Organization:
- Minnesota Univ., Minneapolis, MN (USA)
- OSTI ID:
- 5237085
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of slip on vortex shedding from a circular cylinder in a gas flow
Bubble dynamics in two-phase flows around cylinders