CAJ | 학술논문

针对一种计算流体力学的三维切削网格自动生成方法Kitta Cube,提出一种新的离散方法(6+N模型)来描述和处理Kitta Cube中的任意三维切削网格.该方法能避免对各种类型的切削网格进行穷举分析,实现采用统一模式在三维切削网格上离散和求解N-S方程.用该方法对三维同心球和偏心球之间环形通道内的自然对流换热进行模拟,数值结果表明:通过Kitta Cube能较精确地表达曲面,面积误差在1.0%以内;利用6+N模型能在该网格上实现复杂区域内的流动和传热模拟,其数值精度与贴体网格相当,误差在0.5%以内;降低偏心球环形通道内部球心位置,能增加自然对流的传热性能.
침대일충계산류체역학적삼유절삭망격자동생성방법Kitta Cube,제출일충신적리산방법(6+N모형)래묘술화처리Kitta Cube중적임의삼유절삭망격.해방법능피면대각충류형적절삭망격진행궁거분석,실현채용통일모식재삼유절삭망격상리산화구해N-S방정.용해방법대삼유동심구화편심구지간배형통도내적자연대류환열진행모의,수치결과표명:통과Kitta Cube능교정학지표체곡면,면적오차재1.0%이내;이용6+N모형능재해망격상실현복잡구역내적류동화전열모의,기수치정도여첩체망격상당,오차재0.5%이내;강저편심구배형통도내부구심위치,능증가자연대류적전열성능.
A novel three-dimensional Cartesian cut cell algorithm, referred to as 6+N, is proposed to describe and treat arbitrary three-dimensional Kitta Cube. This method can avoid the enumeration for millions of cutting patterns and implement the discretization and solution of the NS equations in a unified form. The present method is applied to simulate natural convection heat transfer in an annular tunnel between two concentric or eccentric spheres. The numerical results show that Kitta Cube can express curve surfaces accurately with an error of less than 1.0%. The accuracy of solutions obtained by the present method is approximately equivalent to that by the body-fitted method. In addition, higher overall heat transfer coefficients can be achieved by lowering the position of the inner sphere for eccentric arrangement.