/**
 * BoundaryConditions — Dirichlet, Neumann, Robin, and Convection BCs
 * for grid-based PDE solvers.
 */
import { RegularGrid3D } from './RegularGrid3D';
export type BCType = 'dirichlet' | 'neumann' | 'robin' | 'convection';
export type BCFace = 'x-' | 'x+' | 'y-' | 'y+' | 'z-' | 'z+';
export interface BoundaryCondition {
    type: BCType;
    faces: BCFace[];
    /** Fixed value (Dirichlet), flux (Neumann), or reference value (Robin/Convection) */
    value: number;
    /** Heat transfer coefficient h (convection) or alpha (Robin) */
    coefficient?: number;
    /** Ambient temperature for convection BC */
    ambient?: number;
    /** Thermal conductivity for computing Biot number in convection BCs (defaults to 1.0) */
    k?: number;
}
export declare function applyBoundaryConditions(grid: RegularGrid3D, bcs: BoundaryCondition[], dt: number, component?: number): void;
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