Moving Solid (Boundaries)

Moving SolidInteraction of a moving solid body with a fluid is simulated with Gerris, which is an open source code. The solid moves in constant angular velocity around its center. For this goal, Adaptive Mesh Refinement technique is used to generate new cells and merge the old ones, whenever it needs for the entire domain.  It has significant advantages, if it can be extended to multiphase flows with moving solid, such as predicting partially submerged solids, buildings, and structures. Figure consists of two groups of contours, which are thermal and vorticity, for top and bottom, respectively. At top figure, entire domain is filled with cold air, perfectly, and two streams of cold and hot are introduced parallel to each other. The bottom one expresses vortex interactions, which forms these interesting engagements. It is similar to Fujiwara interaction or binary interaction, which occur when two nearby cyclonic vortices orbit each other and close the distance between the circulations of their corresponding low-pressure areas. Using two or more moving solid in 3D, I hope that I can investigate and anticipate the Fujiwhara effect.


Effect of Obstacles on Cavity

Two rigid bodies have located in order to increase the rate of heat transfer inside the cavity. Using appropriate form of solids with smaller pressure drag, maybe it can enhance the hot fluid circulation and heat transfer inside the cavity, and be a good alternative to electric wires. Vortex shedding behind the bodies causes the cavity to possess some small vortices with irregular period, which will be merged and made one big vortex inside the entire cavity, eventually.