CFD Simulations AC3-12: Difference between revisions
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'''Application Challenge AC3-12''' © copyright ERCOFTAC 2013 | '''Application Challenge AC3-12''' © copyright ERCOFTAC 2013 | ||
==Overview of CFD Simulations== | ==Overview of CFD Simulations== | ||
Detailed numerical calculations were also performed by Sommerfeld et al. (1992) | |||
and Sommerfeld and Qiu (1993) using the two-dimensional | |||
axially-symmetric Euler/Lagrange approach without two-way coupling. The | |||
fluid flow calculation is based on the time-averaged Navier-Stokes | |||
equations in connection with a closure assumption for the turbulence | |||
modelling. The solution of the above equations is obtained by using the | |||
so-called FASTEST-code (Dimirdzic and Peric, 1990) which incorporates | |||
the well-known k-ε two-equation turbulence model and uses a finite- | |||
volume approach to descretize the equations. In order to minimize the | |||
effects of numerical diffusion in the present calculations, the | |||
quadratic, upwind-weighted differencing scheme (QUICK) was used for | |||
differencing the convection terms. Furthermore, flux-blending | |||
techniques, where the convective flux can be calculated as a weighted | |||
sum of the flux expressions from the "upwind" and QUICK differencing | |||
schemes (Peric et al., 1988), was used to avoid instabilities and | |||
convergence problems that sometimes appear when using higher order | |||
schemes. The choice of the solution procedure described above was based | |||
on the recommendations of Durst and Wennerberg (1991) who also | |||
concluded that for moderate swirl intensities the k-( turbulence model | |||
performs reasonably well. | |||
==Computational Domain and Boundary Conditions Fluid Flow== | ==Computational Domain and Boundary Conditions Fluid Flow== |
Revision as of 09:56, 12 February 2013
Particle-laden swirling flow
Application Challenge AC3-12 © copyright ERCOFTAC 2013
Overview of CFD Simulations
Detailed numerical calculations were also performed by Sommerfeld et al. (1992) and Sommerfeld and Qiu (1993) using the two-dimensional axially-symmetric Euler/Lagrange approach without two-way coupling. The fluid flow calculation is based on the time-averaged Navier-Stokes equations in connection with a closure assumption for the turbulence modelling. The solution of the above equations is obtained by using the so-called FASTEST-code (Dimirdzic and Peric, 1990) which incorporates the well-known k-ε two-equation turbulence model and uses a finite- volume approach to descretize the equations. In order to minimize the effects of numerical diffusion in the present calculations, the quadratic, upwind-weighted differencing scheme (QUICK) was used for differencing the convection terms. Furthermore, flux-blending techniques, where the convective flux can be calculated as a weighted sum of the flux expressions from the "upwind" and QUICK differencing schemes (Peric et al., 1988), was used to avoid instabilities and convergence problems that sometimes appear when using higher order schemes. The choice of the solution procedure described above was based on the recommendations of Durst and Wennerberg (1991) who also concluded that for moderate swirl intensities the k-( turbulence model performs reasonably well.
Computational Domain and Boundary Conditions Fluid Flow
Modelling of Particle Phase
Contributed by: Martin Sommerfeld — Martin-Luther-Universitat Halle-Wittenberg
© copyright ERCOFTAC 2013