PB_VWAVE-AIRY-PERIOD_P31_XPL.inp
Elements tested
B31
PIPE31
Problem description
Verification problem pb_vwave-airy-period_p31_xpl.inp is identical to pb_airy_p31_xpl.inp as described in Dynamic pressure, closed-end buoyancy loads. It tests the dynamic pressure implementation and closed-end buoyancy loading for Airy waves coded in user subroutine VWAVE. In this problem a vertical pile is fully constrained and subjected to buoyancy loading. Airy wave theory is used to calculate the total reaction force on the structure during a dynamic analysis. Distributed load type PB is used with a 50-element (PIPE31) model, and concentrated load type TSB is used with a one-element (B31) model.
Model:
| Height of the structure | 175.0 (100.0 below and 75.0 above mean water elevation) |
| Pipe section data | r = 1.0, t = 0.25 |
Material:
| Young's modulus | 1 × 106 |
Aqua—environment
| Seabed elevation | 100.0 |
| Mean water elevation | 1100.0 |
| Gravitational constant | 32.2 |
| Fluid mass density | 2.0 |
Results and discussion
The results are identical to those calculated in pb_airy_p31_xpl.inp and agree well with the analytically determined peak total reaction force.
Input files
- pb_vwave-airy-period_p31_xpl.inp
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Input file for this analysis.
- pb_vwave-airy-length_p31_xpl.inp
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Same analysis, but the corresponding wave length is specified instead of the wave period.
- vwave_airy.f
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User subroutine VWAVE used for pb_vwave-airy-period_p31_xpl.inp and pb_vwave-airy-length_p31_xpl.inp.
- pb_vwave-airy-period-opt_p31_xpl.inp
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The wave length calculation from the wave period might be expensive. This optimized input file calculates the wave length once initially and stores the wave parameters appropriately for subsequent usage.
- vwave_airy-opt.f
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User subroutine VWAVE used for pb_vwave-airy-period-opt_p31_xpl.inp.