Drag law for monodisperse gas–solid systems using particle-resolved direct numerical simulation of flow past fixed assemblies of spheres

2011 ◽  
Vol 37 (9) ◽  
pp. 1072-1092 ◽  
Author(s):  
S. Tenneti ◽  
R. Garg ◽  
S. Subramaniam
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Flow Past ◽  
Drag Law

Direct Numerical Simulation of Compressible Flow Past a Low Pressure Turbine Blade at High Incidence

2014 ◽  
Author(s):  
Rajesh Ranjan ◽  
S. M. Deshpande ◽  
Roddam Narasimha
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Direct Numerical Simulation ◽  
Turbine Blade ◽  
Stokes Equations ◽  
Turbulent Channel Flow ◽  
Suction Side ◽  
Low Pressure ◽  
Angle Of Incidence ◽  
Flow Past

A direct numerical simulation (DNS) code has been developed to solve the compressible Navier-Stokes equations. This code is capable of handling unstructured grids, often a requirement for simulating flow past complex geometrical shapes like turbine and compressor blade passages. The code is validated for a compressible turbulent channel flow. Flow past a low pressure (LP) turbine blade passage is computed at Re = 51,831 based on axial chord length and incoming velocity, and angle of incidence = 45.5° with respect to axial chord. Several interesting fluid-dynamical phenomena including multiple separation bubbles and laminar-turbulent-laminar transition cycles are noticed on the suction side of the blade. Also a strong curvature effect is seen in the boundary layer near the leading edge on the suction side, where use of higher order boundary layer theory will be needed.

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