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Feature/KCCd #3481

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9f20236
KC dependent drag for Morison members
willwiley Aug 25, 2026
6f12b8e
KC dependent drag with types update
willwiley Aug 25, 2026
94cb65f
KC dependent drag with types update and allocate fix
willwiley Aug 25, 2026
3f9dece
update KC-Cd function input to assign dummy values values if no table…
willwiley Aug 27, 2026
03dd647
Remove duplicated lines and fix input mistake that didn't set MCF
willwiley Aug 31, 2026
e1c491e
Add check on update discrete state for KC amplitude only for cylindri…
willwiley Aug 31, 2026
4a91ff8
Addition of KC dependent Cd for rectangular members
willwiley Oct 6, 2026
93e9d04
Update KC-Cd documentation
willwiley Oct 6, 2026
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11 changes: 11 additions & 0 deletions docs/source/user/hydrodyn/input_files.rst
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Expand Up @@ -912,6 +912,11 @@ computing the wave load even if second-order wave kinematics are enabled in SeaS
However, the MacCamy-Fuchs diffraction model can be used in conjunction with any of
the available wave-stretching models.

Keulegan-Carpenter number dependent drag coefficient model
++++++++++++++++++++++++++++++++++++
The Keulegan-Carpenter number dependent drag coefficient model can be enabled for circular or rectangular strip-theory
members using member-based coefficients. To enable the model, **MemberCd1** and **MemberCd2** for circular members, or **MemberCdA1**, **MemberCdA2**, **MemberCdB1**, and **MemberCdB2** for rectangular members should be set to the keyword **KC#**, where **#** is an integer indicating which KC-Cd function is used. KC-Cd functions are set in an optional section preceding the Member Output List. For a given member, the same KC-Cd function must be used for both ends of the member (e.g. **MemberCdA1** = **MemberCdA2**).

.. _hd-members:

Members
Expand Down Expand Up @@ -984,6 +989,12 @@ to zero. The hydrodynamic coefficient tables contain coefficients with
and without marine growth. If **MGThck** = 0 for a particular node, the
coefficients not associated with marine growth are used.

.. _hd-keulegan-carpenter-drag-coefficient-functions:

Keulegan-Carpenter Drag Coefficient Functions
-------------
KC-Cd functions are set in an optional section preceding the Member Output List. **NKCCd** defines the number of KC-Cd functions. It is followed by a list of path names for KC-Cd function files. KC-Cd function files are a two column file, where the first column contains increasing Keulegan-Carpenter numbers and the second column contains corresponding drag coefficients. Each of these KC-Cd function files should begin with **NKC**, which sets the number of Keulegan-Carpenter numbers in the function. Note that the functions are linearly interpolated between provided Keulegan-Carpenter numbers, and are constantly extrapolated below the lowest and above the highest Keulegan-Carpenter numbers.

.. _hd-member-output-list:

Member Output List
Expand Down
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