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Optimizatiom of curved diffuser with inner cylindrical wall
Sládek, A. ; Hyhlík, T. ; Příhoda, Jaromír
The aim of the paper is optimization of curved diffusers with rectangular cross-section. The optimization is based on numerical solution of Navier-Stokes equations with standard k-eps turbulence model using FLUENT 6.0 software. The inner wall is cylindrical and the outer wall is described by the Bezier spline curve with two parameters. Energy losses coefficient is very dependent on the radius of the inner wall. The minimum of energy losses was achieved for the ratio Ri/d= 2,25.
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Analysis of turbulent flow in curved channels and diffusers
Příhoda, Jaromír ; Sedlář, M.
Numerical simulation of flow through curved channels and diffusers of rectangular cross section carried out by means of software CFX-TASCflow was focused on the development of secondary flow and the onset of separation region. Turbulent flow through plane diffusers of rectangular cross section with area ratio AR=1.5 was studied. Further, the effect of the inner wall curvature radius on the flow and losses in diffusers was studied. Results were compared with experiments in water channel.
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Numerické řešení proudění zakřiveným difuzorem
Louda, Petr ; Kozel, K. ; Příhoda, Jaromír
Numerical solution of turbulent flow through a curved diffuser is based on the artificial compressibility method. A cell centered finite volume method is used for spatial discretization. The time discretization uses the backward Euler implicit scheme with turbulence model equations solved decoupled from RANS equations. Results obtained by two different turbulence models - two-equation SST model and EARSM model - are compared and discussed.
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