Large eddy simulation of ship airflow control with steady Coanda effect

This paper numerically studies the steady Coanda effect for drag reduction and airwake manipulations on Chalmers ship model (CSM) using large eddy simulation with wall-adapting local-eddy viscosity model. Numerical methods are validated by experimental data acquired from baseline CSM. In creating flow control model, hanger base of CSM is modified surfaces injection slots along its roof edge two side edges. Four representative cases studied: a no-jet case three same momentum coefficient jet activated at different locations (roof, sides, combined). The results show that four have various performances in vortex structures deck. They also mean turbulent quantities as well POD (proper orthogonal decomposition) modes their airwake. It found roof-jet has stronger more vectored toward low-speed area (LSA) deck than side-jets detach earlier surface. energization process is, therefore, where effective directly brings high to LSA manipulate shear layers mixing enhancement. achieve better mitigation re-circulation higher recovery streamwise velocity lower fluctuation analysis suggests can stabilize wake.