High-Precision Numerical Scheme for Vortical Flow
- 1 dvanced Nuclear System Research and Development Directorate, Japan Atomic Energy Agency, Ibaraki, Japan
- 2 Department of Nuclear Engineering, Kyoto University, Kyoto, Japan
- 3 Advanced Nuclear System Research and Development Directorate, Japan Atomic Energy Agency, Ibaraki, Japan
Abstract
In this study, a new high-precision numerical simulation scheme for vortical flows (vortex-based scheme) is proposed. This scheme identifies a vortical flow in each computational cell, and then, reconstructs a vortical velocity distribution based on the Burgers vortex model. In addition, a pressure distribution in the vicinity of the vortex center is also reconstructed. The momentum transfer is calculated with the reconstructed velocity and pressure distributions, and therefore, the vortex-based scheme can simulate vortical flows more accurately than the conventional schemes. In fact, as the simulation result of inviscid vortex attenuation problem, the vortex-based scheme shows lower simulation error compared to the conventional discretization schemes. Moreover, also in the numerical simulation of the quasi-steady vortical flow, the simulation accuracy of the vortex-based scheme is superior to those of the conventional schemes.
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