The three-dimensional unsteady computations of fish swimming with oscillating and deforming fins of varying rigidity were carried out. The objective of these variable rigidity computations was to investigate the importance of fin deformation of the fluid dynamics of force production. An unstructured grid-based unsteady Navier-Stokes solver with automatic adaptive remeshing was used to compute the flow about the wrasse through several complete cycles of pectoral fin oscillation for each of ...
The unsteady air flow over the aft deck of the LPD-l7 is computed. The primary goal of this project is to demonstrate that a computational capability is available to confidently predict the airwake about ship superstructures. The unstructured mesh-based incompressible flow solver, FEFLO, is used to compute this unsteady flow. Computed results are compared with wind tunnel model test experimental data at select locations ...
The FAST3D flow solver was used to analyze the unsteady temperature field for a baseline configuration and a proposed upgrade configuration for the DDG-51 Flt-IIA destroyer. The upgrade configuration was proposed to reduce IR signature without impacting other systems, particularly sensitive electronic equipment. The goal of this computational study was to analyze the Unsteady temperature field for the proposed upgrade configuration and identify areas of ...
A 3-D incompressible unsteady flow solver based on simple finite elements with adaptive remeshing and grid movement for both moving and deforming surfaces is described. We demonstrate the combination of adaptive remeshing technique with the incompressible flow solver by computing the flow past an undulating eel in 2-D and past a swimming bluefin tuna in 3-D. It is clear that proper choice of the amplitude and frequency of undulation is ...
An implicit finite element solver for three dimensional incompressible flows with adaptive remeshing has been developed. This flow solver is employed for the simulation of an unsteady torpedo launch from a submarine. Several mesh movement algorithms have been developed and implemented. The use of gliding points on surfaces in the vicinity of a moving body has proven valuable in reducing the number of remeshings and thus reducing the total CPU ...
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