ReadBCs

input: FILE *fp, Element_List *U

output: Bndry *bndry_list

Description: This function reads boundary information for a spectral element field and sets up the appropriate boundary structures. The following boundary conditions are currently recognized:

Flag	Type	Field 1	Field 2	Field 3
V	Velocity	U-velocity	V-Velocity	W-Velocity
W	Wall	= 0	= 0	= 0
v	v	U(x,y,z)	V(x,y,z)	W(x,y,z)
F	Flux	U' = f1	V' = f2	W' = f3
f	flux	U'(x,y,z)	V'(x,y,z)	W'(x,y,z)
O	Outflow	U' = 0	V' = 0	W' = 0
E	Element	w/ ID	w/ EDGE
P	Periodic	w/ ID	w/ EDGE

NOTES: - On the first call, this function records the beginning of the BC

section. Subsequent calls will re-read the BC's and assign data

from the next available parameter. There should be a total of DIM

parameters available (DIM $\leq$ 3). - For boundaries with a given function of (x,y,z), the first line

following is taken to be U(x,y,z), the second is V(x,y,z), etc.

Here is an example (element 1, edge 1):

1

1

v

0.0

0.0

0.0

ux = (1 - y2)*sin(t)

uy = (1 - y2)*cos(t) uz = 0.

1

2

E

2.0

1.0

0.0

The "=" MUST be present, and the function is defined by the string

to the right of it. - NO TIME DEPENDENT BOUNDARY CONDITIONS. - This routine will read any type of boundary conditions, FLUID or

otherwise, as long as the file is positioned correctly.