Suppression of three-dimensional flow instabilities in tube bundles

We study the generation of three-dimensional vorticity in tightly packed tube bundles. In particular, our goal is to investigate which conditions (if any) enable the flow to remain two-dimensional for Re>180. We calculated two- and three-dimensional flow through periodic rotated square tube bundles with tight packing, P/D=1.5, using a high resolution pseudo-spectral code with penalization. The tubes are cylinders whose response is modelled as a …