In many applications there is a need to simulate transient flows around bodies over a longer period. While the flow usually takes place in a large domain, engineers are mostly interested only in the solution in the immediate vicinity of the body. It is therefore very important to be able to reduce the size of the computational domain and thus reduce the computing effort while not compromising the accuracy and reliability of the solution. This paper describes one approach, which can be applied, among others, to flows around floating or flying bodies. The idea is to force the solution of the 3D Navier-Stokes equations towards a solution based on some simplified theory (or 2D solution in a larger domain) over some distance around the body. This resolves the problem of specifying boundary conditions on the reduced solution domain boundaries. In this way, damping of waves reflected from bodies and propagating toward the inlet can also be achieved. The method has been implemented in the commercial flow solver STAR-CCM+ and tested on several application examples. The results demonstrate the benefits of this approach compared to the alternative ways of simulating such flows.

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