Large Scale Parallel Computing and Scalability Study for Surface Combatant Static Maneuver and Straight Ahead Conditions Using CFDShip-Iowa

Scalability studies are performed for CFDShip-Iowa URANS/DES curvilinear and Cartesian grid solvers and calculations are performed using largest grids to date. Verification and validation study is performed for V4-DES solution for DTMB 5415 with bilge keels at 20 static drift using up to 250M grid. The instantaneous and mean flow field is analyzed to identify flow separation patterns, vortical structures and associated instabilities. V6 RANS solution of 5415 bare hull at straight ahead condition on 276M grid is compared with benchmark V4-blended k-ω/k-e, V4-wallfunction, V4-DES results and EFD data to identify limitations of wall-layer modeling using WF for immersed boundary method.