Numerical investigation on the flow around a square cylinder with an upstream splitter plate at low Reynolds numbers (original) (raw)

The present study focuses on the flow over a 2D square cylinder, with a plate placed in front of it. An inhouse code using the lattice Boltzmann method (LBM) was employed for all the simulations presented. Few cases were simulated using the open source code Nektar++, the results obtained from both methodologies were compared. Regarding the plate, three related parameters, velocity ratio, distance between the plate and cylinder, and the thickness of the plate, were studied in order to evaluate the impact of these parameters on the flow behavior. The interactions between these parameters were as well investigated. The POD technology was also employed to predict the flow behavior based on the existing information. It turned out the POD technology is a trustable methodology to mathematically pre-investigate the flow field, therefore it is capable of saving large computational resources. From the present results predicted by the POD technology, it was observed that the number of the existing modes has a crucial impact on the results, the higher the number of modes, the better the predicted results.