와류입자법에 의한 비정상 박리흐름의 전산 (II) - 안전성과 와류입자 재배열 -

Computation of Unsteady Separated Flows Using the Vortex Particle Method (ll) - Stability and Particle Redistribution -

As part of study on separated flow using the vortex particle method, stability of the method and particle redistribution were scrutinized. Stability was investigated by choosing different combination of numerical parameters. The Gaussian vortex was considered to make the problem simple by eliminating the complexity due to presence of walls. It was shown that the numerical method was stable when $v{\Delta}t/h^2{\leq}0.5$. In all the stable cases the circulation and the linear momentum were conserved. Without the particle redistribution, the angular momentum was severely attenuated.