%H_linear%

linear smoothing length distribution with respect to a plane

Form a plane. On one side, the smoothing length is constant. On the other side, the smoothing length linearly grows.

SMOOTH_LENGTH($SLflag$) = ( %H_linear%, H_min, L_min, normal_x, normal_y, normal_z, H_max )

H_min: Minimum smoothing length on the given plane L_min: Distance in normal direction within which H is kept at the value of H_min (positive value). If set to zero, linear growth starts at the plane. (normal_x, normal_y, normal_z): Vector perpendicular to the plane. The norm of the vector gives dH/dr, i.e. the growth rate of H when tending apart from the plane. H_max: maximum smoothing length

Linear growth on both sides

One can specify a region of constant smoothing length and linear growth on both sides of the plane via optional parameters:

SMOOTH_LENGTH($SLflag$) = ( %H_linear%, H_min, L_min, normal_x, normal_y, normal_z, H_max, OPTIONAL:L_min_neg , OPTIONAL:dHdr_neg )

L_min_neg: Distance in negative normal direction within which the smoothing length is kept constant. If set to zero, linear growth starts at the plane. dHdr_neg: Growth rate in negative normal direction and for distances larger than L_min_neg. If not specified, the same value is used as on the other side of the plane, i.e. the norm of (normal_x, normal_y, normal_z). Note: H_max also applies in negative normal direction.