Numerical Simulation of Rotation of Intermeshing Rotors using Added and Eliminated Mesh Method

To compute flows around objects with complicated motion like the intermeshing rotors, the unstructured moving grid finite volume method was developed. Computational elements are added and eliminated according to motion of rotors, to keep the computation domain around rotors which mutually reverse. Also, the geometric conservation law is satisfied in the method, using four dimensional space time unified domain for control volume. Using the method, accurate computation is carried out without interpolation of physical quantities. Applying to a flow around a sphere, computation procedure was established with introduction of concept of a hierarchical grid distinction. Then, the results of application to the flow around intermeshing rotors showed efficacy of the method. The results also showed applicability of the method to compute flows around any complicated motion.