Function scale_surface 

pub fn scale_surface<T>(
    backend: ComputeBackend,
    a: &SurfaceField<T>,
    s: f64,
) -> SurfaceField<T>
where
    T: Copy + Send + Sync + Mul<f64, Output = T>,

Uniform scaling of a surface field, c = a * s — internal faces and every boundary patch.

Name, mesh, and boundary conditions come from a. Units: [a]*[s].