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The scene uses uses Plain Force  to  to create the wind and drag particles to visualize the streamlines. Forward Transfer advection helps keeping the streamlines tight. The particles are emitted using a discharge modifier on the source to make them appear only at certain positions. Also added some Classic Vorticity. The streamlines are made up of Phoenix Drag particles. they are just carried with the velocity field. The Drag particles are emitted in lines from a box, and a Discharge Modifier with a curve with spikes is used in the Phoenix Source, so the streamlines appear only at certain positions over the emitter box. The top, bottom and side walls of the Grid are jammed, in order to channel the velocity better. Only the front and back walls are open. Forward Transfer advection helps keeping the streamlines tight. Also some Classic Vorticity is used. You could experiment with PCG  PCG or Direct Symmetric  Direct Symmetric conservation. Additionally, you could make the grid completely 2D and use use Multi-Pass Pass advection which has a little different feel. The Drag particles are emitted with Velocity channel and then Motion Blue is used for the V-Ray rendering.