Taking AutoCAD2000 as platform, an algorithm for the reconstruction ofsurface from scattered data points based on VBA is presented. With this core technology customerscan be free from traditional AutoCAD as an electro...Taking AutoCAD2000 as platform, an algorithm for the reconstruction ofsurface from scattered data points based on VBA is presented. With this core technology customerscan be free from traditional AutoCAD as an electronic board and begin to create actual presentationof real-world objects. VBA is not only a very powerful tool of development, but with very simplesyntax. Associating with those solids, objects and commands of AutoCAD 2000, VBA notably simplifiesprevious complex algorithms, graphical presentations and processing, etc. Meanwhile, it can avoidappearance of complex data structure and data format in reverse design with other modeling software.Applying VBA to reverse engineering can greatly improve modeling efficiency and facilitate surfacereconstruction.展开更多
针对近连续流过渡区多尺度绕流问题,学界发展了N-S(Navier-Stokes)/DSMC(direct simulation Monte Carlo)耦合方法,大多数此类求解器面临着耦合界面波动失稳的难题,因此对复杂外形和耦合界面的通用性值得重点研究。鉴于非结构网格面向...针对近连续流过渡区多尺度绕流问题,学界发展了N-S(Navier-Stokes)/DSMC(direct simulation Monte Carlo)耦合方法,大多数此类求解器面临着耦合界面波动失稳的难题,因此对复杂外形和耦合界面的通用性值得重点研究。鉴于非结构网格面向复杂外形高度的贴体性、优良适应性以及工程领域对过渡流区高效通用型计算方法的需求,提出并实现了一套三维复杂界面四面体非结构网格N-S/DSMC耦合方法用于模拟高超声速过渡流。该方法使用局部克努森数作为连续失效参数划分连续/稀薄区域,并生成三维复杂N-S/DSMC耦合界面,沿分界面两侧分别推进一层或多层界面信息传递单元,基于边界状态法进行信息耦合。该耦合方法无需对复杂不规则分界面作光滑和修型处理,具备对复杂过渡流区工程问题数值模拟的通用性。分别对三维高超声速圆球和钝锥绕流进行模拟,数值结果显示:与参考文献中的DSMC方法相比,激波处数值和壁面特征值基本一致,最大误差不超过8%,但计算效率分别提高了1.74倍和2.28倍,验证了该耦合方法的正确性和高效性。展开更多
文摘Taking AutoCAD2000 as platform, an algorithm for the reconstruction ofsurface from scattered data points based on VBA is presented. With this core technology customerscan be free from traditional AutoCAD as an electronic board and begin to create actual presentationof real-world objects. VBA is not only a very powerful tool of development, but with very simplesyntax. Associating with those solids, objects and commands of AutoCAD 2000, VBA notably simplifiesprevious complex algorithms, graphical presentations and processing, etc. Meanwhile, it can avoidappearance of complex data structure and data format in reverse design with other modeling software.Applying VBA to reverse engineering can greatly improve modeling efficiency and facilitate surfacereconstruction.
文摘针对近连续流过渡区多尺度绕流问题,学界发展了N-S(Navier-Stokes)/DSMC(direct simulation Monte Carlo)耦合方法,大多数此类求解器面临着耦合界面波动失稳的难题,因此对复杂外形和耦合界面的通用性值得重点研究。鉴于非结构网格面向复杂外形高度的贴体性、优良适应性以及工程领域对过渡流区高效通用型计算方法的需求,提出并实现了一套三维复杂界面四面体非结构网格N-S/DSMC耦合方法用于模拟高超声速过渡流。该方法使用局部克努森数作为连续失效参数划分连续/稀薄区域,并生成三维复杂N-S/DSMC耦合界面,沿分界面两侧分别推进一层或多层界面信息传递单元,基于边界状态法进行信息耦合。该耦合方法无需对复杂不规则分界面作光滑和修型处理,具备对复杂过渡流区工程问题数值模拟的通用性。分别对三维高超声速圆球和钝锥绕流进行模拟,数值结果显示:与参考文献中的DSMC方法相比,激波处数值和壁面特征值基本一致,最大误差不超过8%,但计算效率分别提高了1.74倍和2.28倍,验证了该耦合方法的正确性和高效性。
