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Hi all, In BC - surfaces - choose an inflow surface - simple boundary condition, there is a "turbulence input type". 1) What does the choice of "direct" mean? 2) Does "direct" mean direct numerical simulation? (Which means that there is no turbulence) 3) If I choose "Intensity and length scale", what is the proper dimension for the length scale? ( I am modelling a 2D 4m*4m square in a large rectangular fluid domain, interested in the drag force) Any help is highly appreciated. Thanks all. Fangyuan