nablaw method

double nablaw(
  1. double r
)

Implementation

double nablaw(double r) {
  final h = smoothingRadius;
  final nabla = (945.0 / (32.0 * math.pi * math.pow(h, 9))) * (h * h - r * r) * (7 * r * r - 3 * h * h);
  return nabla;
}