Short Answer Flashcards
What is the oldest turbulence model still in use, and when was it developed?
The mixing length model by Prandtl, in 1925
Who developed the first LES with an eddy viscocity model, and when?
Smagorinsky, in 1963
What did Smagorinsky develop in 1963?
The first LES with an eddy viscocity model
What did Jones and Launder develop in 1972?
The k-epsilon model, the first two-equation turbulence model for RANS
What was the first two-equation turbulence model for RANS called?
The k-epsilon model
Who developed the first two-equation turbulence model for RANS, and when?
Jones and Launder, in 1972
What did Rhie and Chow develop in 1983?
Methods for solving the pressure Poisson equation
Who developed the methods for solving the Poisson equation, and when?
Rhie and Chow, in 1983
Who developend the k-omega model, and when?
Wilcox, in 1988
What did Wilcox develop in 1988?
The k-omega model
Who developed the dynamic eddy viscocity LES model, and when?
Germano, in 1990
What did Germano develop in 1990?
A dynamic eddy viscocity LES model
Who developed the SST model, and when?
Menter in 1994
What did Menter develop in 1994?
The SST model
What does SST stand for?
Shear Stress Transport
Why do we use CFD (3)?
Cheap, hazard-free and field quantities simultaneously accessible without measurement errors
What are (in three words) the three steps of pre-processing?
Generation, conditions, modelling
What do we generate in the first step of pre-processing?
The computational grid and geometry
What do we model in the final step of pre-processing?
The fluid and turbulence
What are (in three words) the three steps of post-processing?
Visualization, quantification, interpretation
What do we quantify in the second step of post-processing?
The uncertainties and errors
What is the equation for the Knudsen number?
Kn = {\displaystyle \lambda}/L
What is the approximate value for Kn in continuum mechanics?
Kn «_space;1
What does the Knudsen number represent?
The ratio between the mean free path and representative physical length scale of a molecule