Struct SourceContribution 

pub struct SourceContribution {
    pub explicit: f64,
    pub implicit: f64,
}

The explicit and implicit halves of a source term, per cell.

Upstream splits a source into Su (explicit, independent of the solution) and Sp (implicit, the coefficient of φ). Keeping them apart is not bookkeeping: putting a stabilising negative coefficient on the diagonal rather than in the right-hand side is what keeps the matrix diagonally dominant and the solve stable, and it is why a Darcy drag is written implicitly.

Units

explicit is in the units of the equation’s residual per unit volume; implicit in those units divided by the solved variable. Both are per unit volume — multiplication by the cell volume happens when the contribution is placed into the matrix, matching upstream, which writes Sp[celli] += Vc*S.

Fields

explicit: f64

The part independent of the solved variable, per unit volume.

implicit: f64

The coefficient of the solved variable, per unit volume.

Negative values stabilise. A sink proportional to the solution has a negative coefficient here, and it lands on the matrix diagonal with the sign flipped, increasing diagonal dominance.

Trait Implementations

impl Clone for SourceContribution

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for SourceContribution

impl Debug for SourceContribution

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for SourceContribution

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for SourceContribution

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for SourceContribution