三維可調性無結構網格之數值計算

Simulation of 3-D Inviscid Flow on an Adaptively Refined Grid

蔣佑良(Yu-Li Chiang)

《中國航空太空學會學刊》 31卷4期 (1999/12) Pp. 317-323

https://doi.org/10.6124/TAASRC.199912_31(4).09

摘要

本文配合Icem的無結構網格製作程式，發展無結構網格之流場計算solver，進而發展可調細網格數值計算模式，文中機翼測試結果顯示已完成有限體(Finite Volume)流場計算的Solver。此外，爲了保持卡氏(Cartesian)垂直座標網格的優點，本文亦配台有限體數值計算，發展一新的可調性細網格系統，此網格的基本架構採卡氏座標八分樹法(Octree)，但在接近物體的網格則以垂直投影於物體來重建網格，此網格在三維可保持積分控制體爲一致的六面體（二維爲四邊型），文中二維圓柱體的測試結果顯示，此網格能獲得與鄰近物體之網格爲任意形狀的結果相當一致。

關鍵字

可調性 ； 無結構 ； 八分樹法

並列摘要

The original purpose of this work is to develop a finite volume solver based on the unstructured grid generated by the commercial code, for example, ICEM. After it is successfully applied to unstructured grid, we extend our code to the adaptively refined grid in order to solve more sophisticated problems. From the test results, we are quite satisfied with the extension. Finally, for preserving the advantages of the Cartesian coordinates, we develop a new Cartesian grid system. In this grid system, the orthogonal grids near body are projected on the body to form a new element. The method also can prevent from too many different shapes of the elements near the body. A two dimensional cylinder flow is calculated and the result is amazing.

並列關鍵字

Adaptively ； Unstructured ； Octree