Hydrodynamic pressure and added mass for axisymmetric bodies
Abstract
A finite element method for determining the hydrodynamic pressure distribution on rigid axisymmetric bodies oscillating in a fluid is presented. The bodies considered are symmetric about a vertical axis; and they can either totally or partially submerged. A transmitting boundary is used to truncate the horizontal unbounded fluid domain. The formulation of added masses in the equations of motion of rigid bodies in fluid is presented. A computer program is developed which calculates pressure distributions and added masses for axisymmetric bodies oscillating at a specified frequency in the horizontal, vertical and rotational directions. The effects of compressibility of fluid and surface waves generated by oscillating bodies are also studied. Surface waves are found to have an effect on the added mass and hydrodynamic damping at low frequency while compressibility of the fluid has a significant effect at high frequency for cases involving large fluid depths.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- May 1980
- Bibcode:
- 1980STIN...8120404N
- Keywords:
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- Axisymmetric Bodies;
- Finite Element Method;
- Hydrodynamic Equations;
- Mass;
- Pressure Distribution;
- Approximation;
- Compressibility Effects;
- Computer Programs;
- Pressure Oscillations;
- Submerged Bodies;
- Fluid Mechanics and Heat Transfer