The magnetohydrodynamic(MHD) three-dimensional flow of Jeffrey fluid in the presence of Newtonian heating is investigated. Flow is caused by a bidirectional stretching surface. Series solutions are constructed for the...The magnetohydrodynamic(MHD) three-dimensional flow of Jeffrey fluid in the presence of Newtonian heating is investigated. Flow is caused by a bidirectional stretching surface. Series solutions are constructed for the velocity and temperature fields. Convergence of series solutions is ensured graphically and numerically. The variations of key parameters on the physical quantities are shown and discussed in detail. Constructed series solutions are compared with the existing solutions in the limiting case and an excellent agreement is noticed. Nusselt numbers are computed with and without magnetic fields. It is observed that the Nusselt number decreases in the presence of magnetic field.展开更多
Heat and mass transfer effects in three-dimensional flow of Maxwell fluid over a stretching surface were addressed.Analysis was performed in the presence of internal heat generation/absorption. Concentration and therm...Heat and mass transfer effects in three-dimensional flow of Maxwell fluid over a stretching surface were addressed.Analysis was performed in the presence of internal heat generation/absorption. Concentration and thermal buoyancy effects were accounted. Convective boundary conditions for heat and mass transfer analysis were explored. Series solutions of the resulting problem were developed. Effects of mixed convection, internal heat generation/absorption parameter and Biot numbers on the dimensionless velocity, temperature and concentration distributions were illustrated graphically. Numerical values of local Nusselt and Sherwood numbers were obtained and analyzed for all the physical parameters. It is found that both thermal and concentration boundary layer thicknesses are decreasing functions of stretching ratio. Variations of mixed convection parameter and concentration buoyancy parameter on the velocity profiles and associated boundary layer thicknesses are enhanced. Velocity profiles and temperature increase in the case of internal heat generation while they reduce for heat absorption. Heat transfer Biot number increases the thermal boundary layer thickness and temperature. Also concentration and its associated boundary layer are enhanced with an increase in mass transfer Biot number. The local Nusselt and Sherwood numbers have quite similar behaviors for increasing values of mixed convection parameter, concentration buoyancy parameter and Deborah number.展开更多
研究潜艇在斜航工况下的水动力特性对潜艇操纵性的影响至关重要。本文使用雷诺平均RANS(Reynolds Average Navier-Stockes)与分离涡DES(Detached-Eddy Simulation)2种数值方法,对Joubert BB2潜艇在斜航工况下水动力性能及周围流场进行...研究潜艇在斜航工况下的水动力特性对潜艇操纵性的影响至关重要。本文使用雷诺平均RANS(Reynolds Average Navier-Stockes)与分离涡DES(Detached-Eddy Simulation)2种数值方法,对Joubert BB2潜艇在斜航工况下水动力性能及周围流场进行数值模拟。分析不同漂角工况下潜艇所受力、力矩及周围流场,重点关注围壳及尾舵附近流场,探寻漂角变化对潜艇受力及流场的影响。结果显示,采用DES方法计算大漂角工况时误差更小同时流场信息捕捉更加精确。研究结果表明,潜艇大漂角工况下采用DES方法能够更加准确地模拟潜艇受力及流场,同时对研究潜艇斜航状态下的流动分离现象具有一定的参考价值。展开更多
文摘The magnetohydrodynamic(MHD) three-dimensional flow of Jeffrey fluid in the presence of Newtonian heating is investigated. Flow is caused by a bidirectional stretching surface. Series solutions are constructed for the velocity and temperature fields. Convergence of series solutions is ensured graphically and numerically. The variations of key parameters on the physical quantities are shown and discussed in detail. Constructed series solutions are compared with the existing solutions in the limiting case and an excellent agreement is noticed. Nusselt numbers are computed with and without magnetic fields. It is observed that the Nusselt number decreases in the presence of magnetic field.
文摘Heat and mass transfer effects in three-dimensional flow of Maxwell fluid over a stretching surface were addressed.Analysis was performed in the presence of internal heat generation/absorption. Concentration and thermal buoyancy effects were accounted. Convective boundary conditions for heat and mass transfer analysis were explored. Series solutions of the resulting problem were developed. Effects of mixed convection, internal heat generation/absorption parameter and Biot numbers on the dimensionless velocity, temperature and concentration distributions were illustrated graphically. Numerical values of local Nusselt and Sherwood numbers were obtained and analyzed for all the physical parameters. It is found that both thermal and concentration boundary layer thicknesses are decreasing functions of stretching ratio. Variations of mixed convection parameter and concentration buoyancy parameter on the velocity profiles and associated boundary layer thicknesses are enhanced. Velocity profiles and temperature increase in the case of internal heat generation while they reduce for heat absorption. Heat transfer Biot number increases the thermal boundary layer thickness and temperature. Also concentration and its associated boundary layer are enhanced with an increase in mass transfer Biot number. The local Nusselt and Sherwood numbers have quite similar behaviors for increasing values of mixed convection parameter, concentration buoyancy parameter and Deborah number.
文摘研究潜艇在斜航工况下的水动力特性对潜艇操纵性的影响至关重要。本文使用雷诺平均RANS(Reynolds Average Navier-Stockes)与分离涡DES(Detached-Eddy Simulation)2种数值方法,对Joubert BB2潜艇在斜航工况下水动力性能及周围流场进行数值模拟。分析不同漂角工况下潜艇所受力、力矩及周围流场,重点关注围壳及尾舵附近流场,探寻漂角变化对潜艇受力及流场的影响。结果显示,采用DES方法计算大漂角工况时误差更小同时流场信息捕捉更加精确。研究结果表明,潜艇大漂角工况下采用DES方法能够更加准确地模拟潜艇受力及流场,同时对研究潜艇斜航状态下的流动分离现象具有一定的参考价值。
