6.15.3. The PMOD Data Record—Prescribed Pressure Mode Definition

This data record is used to define a prescribed pressure mode on the inside moonpool mean free surface. The center of the inside free surface area is , which is calculated automatically, based on the inside free surface panels.

    2   5  7   11    16    21
  - --- -- ---- ----- ----- -----------
 |X|XXX|02|PMOD|MSHP |XXXXX|(MODX=???,MODY=???)
  - --- -- ---- ----- ----- ----------------
         |  |     |           |
         |  |     |           |_(4)Modal No. in X direction, n; Modal No. in Y direction, m.
         |  |     |     
         |  |     |_(3)Modal Shape Function Identifier of Pressure
         |  |
         |  |_(2)Mandatory data record keyword.
         |
         |_(1)Optional User Identifier.

(3) Three types of pressure modal shapes are available. For further information, see Prescribed Oscillatory Pressure Distribution Approach.

Series of sine and cosine functions, four identifiers could be defined:

  • SNSN:

  • SNCS:

  • CSSN:

  • CSCS:

Series of Legendre polynomial functions:

  • LGPL:

Series of Bessel functions for axisymmetric moonpool:

  • BESS:

Note:  The value of MODE is greater than zero in the MOON data record and MODE data records of PMOD are expected to be input. Any combination of these three pressure modal shapes is permitted, but duplications should be avoided. MODY is not required for Bessel function BESS.