*FLOWCFD

Data format:

One line with up to 15 parameters (the first parameter only is compulsory) followed by an arbitrary number of lines

NODE X1C(1) X1C(2) X1C(3) X2C(1) X2C(2) X2C(3) X3C(1) X3C(2) X3C(3) IGRS ICFD ION ICHECK INTER
t0 file_for_t0
t1 file_for_t1
...

Status:

Optional.

Purpose:

To take an external flow field into account in the calculation of the hydrodynamic loads exerted along the pipe. The flowfiled is time dependant, one file is provided per time.

Restrictions:

None.

Details :

Parameter	Description
NODE	The box is centered on NODE and is defined by the Node frame of reference.
X1C(1) ... X3C(3)	To define a frame of reference. The box is centered on (xc,yc,zc), and is given the orientation of the new frame (defined with respect to Nodes frame).
IGRS	A file flowfiled.dat is created and regenarated at each time step. For group IGS, it contains for all the Gauss points along the line : time, arc lengh, position (x,y,z) in the global frame, fluid-structure velocity (vx, vy, vz) in the global frame
ICFD	ICFD = 0 : the ramptime is not taken into account for the fluid velocity in the CFD field ICFD = 1 : the ramptime is taken into account
ION	ION = 0 : The position of the CFD field is based on the initial position of the reference node ION = 1 : The position of the CFD field is based on the current position of the reference node
ICHECK	INTER = 0 : If time dependant CFD files are provided, the compatibility between the files is checked (can be time-consuming) INTER = 1 : No check
INTER	INTER = 0 : The distance between the node under consideration and the nodes in the CFD used for the interpolation of the velocity is computed in meters INTER = 1: The distance is normalized per direction by the mesh size
t0	First time step for CFD file
file_for_t0	Corresponding file
t1	Second time step for CFD file
file_for_t0	Corresponding file

Note

The input file FILENAME used to define the flow field must be a ASCII file with the following format :

  L B H   ! Grid dimensions
  xc yc zc ! Grid center / FU ref frame
  nx ny nz ! Grid subdivision
  3 ! Number of fields
  U V W !  List of fields
  ntot ! Total number of points
  nmax ! Max number of points / box :
  !
  ! loop for i =1 to nx
  ! loop for j =1 to ny
  ! loop for k =1 to nz
  !
  i  j  k n ! box and number of points in the box
  ! boucle l =1 n
  x(i,j,k,l) y(i,j,k,l) z(i,j,k,l) U(i,j,k,l) V(i,j,k,l) W(i,j,k,l)