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*DAMPBODY

Data format:

An arbitrary number of lines comprising 4 values.

NODE ROW COL DAMPING IOVEL

Status :

Optional

Purpose :

To define linear damping forces/moments applied to a node based on its local axes system.

Details :

Parameter	Description
NODE	Node to which the damping matrix is applied.
ROW	Row identification of the matrix
COL	Column identification of the matrix
DAMPING	Damping value stored in (ROW,COL). Units of the D(6x6) damping matrix terms are as follows: Dij with i=1,3; j=1,3 : N/(m/s) Dij with i=1,3; j=4,6 : N/(rad/s) Dij with i=4,6; j=1,3 : N.m/(m/s) Dij with i=4,6; j=4,6 : N.m/(rad/s)
IOVEL	By default the damping force/moment is computed based on the velocity of the structure. Two other options are available. IOVEL = 0 (Default) : velocity of the structure is used IOVEL = 1 : the translational velocity is based on velocity of the structure minus wave velocity (rotational velocity unchanged) IOVEL = 2 : the translational velocity is based on velocity of the structure minus wave velocity minus current velocity (rotational velocity unchanged)

Note

if ROW is not equal to COL, the value is entered at both (ROW,COL) and (COL,ROW) since the matrix is symmetric. The matrix is defined in the local frame of the node.