An analytical solution of the governing equations of the interacting shear flows for unsteady oblique stagnation point flow is obtained. It has the same form as that of the exact solution obtained from the complete NS...An analytical solution of the governing equations of the interacting shear flows for unsteady oblique stagnation point flow is obtained. It has the same form as that of the exact solution obtained from the complete NS equations and physical analysis and relevant discussions are then presented.展开更多
通过求解二维非定常可压N-S方程,研究了带扰流片的NACA0012翼型绕流问题。首先计算了扰流片固定在三个不同张开角度时的流动,气动力系数变化规律和已有实验数据对比,结论一致。并着重描述了扰流片张开时,背风区涡形成、发展和脱落过程,...通过求解二维非定常可压N-S方程,研究了带扰流片的NACA0012翼型绕流问题。首先计算了扰流片固定在三个不同张开角度时的流动,气动力系数变化规律和已有实验数据对比,结论一致。并着重描述了扰流片张开时,背风区涡形成、发展和脱落过程,分析了非定常气动力产生的机理。为了进一步探讨振动扰流片对主翼的影响,采用Ch im era重叠网格技术处理多体相对移动问题,分析了振动频率和振动幅度两个因素对时均气动力的影响。展开更多
In this paper, a full discrete local projection stabilized （LPS） method is proposed to solve the optimal control problems of the unsteady Navier-Stokes equations with equal order elements. Convective effects and pre...In this paper, a full discrete local projection stabilized （LPS） method is proposed to solve the optimal control problems of the unsteady Navier-Stokes equations with equal order elements. Convective effects and pressure are both stabilized by using the LPS method. A priori error estimates uniformly with respect to the Reynolds number are obtained, providing the true solutions are sufficient smooth. Numerical experiments are implemented to illustrate and confirm our theoretical analysis.展开更多
The unsteady flow around a circulation control (CC) airfoil was investigated with Navier-Stokes method,which includes the flow around CC airfoil with pulsating jet,the flow around oscillating CC airfoil,and the flow a...The unsteady flow around a circulation control (CC) airfoil was investigated with Navier-Stokes method,which includes the flow around CC airfoil with pulsating jet,the flow around oscillating CC airfoil,and the flow around oscillating CC airfoil with pulsating jet.Dynamic properties of the flow and the aerodynamic forces were rewaled.展开更多
文摘An analytical solution of the governing equations of the interacting shear flows for unsteady oblique stagnation point flow is obtained. It has the same form as that of the exact solution obtained from the complete NS equations and physical analysis and relevant discussions are then presented.
文摘通过求解二维非定常可压N-S方程,研究了带扰流片的NACA0012翼型绕流问题。首先计算了扰流片固定在三个不同张开角度时的流动,气动力系数变化规律和已有实验数据对比,结论一致。并着重描述了扰流片张开时,背风区涡形成、发展和脱落过程,分析了非定常气动力产生的机理。为了进一步探讨振动扰流片对主翼的影响,采用Ch im era重叠网格技术处理多体相对移动问题,分析了振动频率和振动幅度两个因素对时均气动力的影响。
基金This work is supported by the Natural Science Foundation of China （No. 11271273） and the Scientific Research Foundation of the Education Department of Sichuan Province of China （No.16ZB0300）. The authors would like to thank the associate editor and anonymous referees comments to improve the quality of the manuscript.
文摘In this paper, a full discrete local projection stabilized （LPS） method is proposed to solve the optimal control problems of the unsteady Navier-Stokes equations with equal order elements. Convective effects and pressure are both stabilized by using the LPS method. A priori error estimates uniformly with respect to the Reynolds number are obtained, providing the true solutions are sufficient smooth. Numerical experiments are implemented to illustrate and confirm our theoretical analysis.
基金Present address: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China.
文摘The unsteady flow around a circulation control (CC) airfoil was investigated with Navier-Stokes method,which includes the flow around CC airfoil with pulsating jet,the flow around oscillating CC airfoil,and the flow around oscillating CC airfoil with pulsating jet.Dynamic properties of the flow and the aerodynamic forces were rewaled.
