339 lines
9.8 KiB
Rust
339 lines
9.8 KiB
Rust
// TDD: GREEN phase - Implement core traits to pass tests
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use crate::error::CfdResult;
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use nalgebra::{Scalar, Vector3};
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use std::fmt::Debug;
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/// Trait for fluid field data structures that hold velocity, pressure, and other flow variables
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pub trait FluidField: Send + Sync + Debug {
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/// Scalar type for field values (typically f32 or f64)
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type Scalar: Scalar + Copy + Send + Sync + Debug;
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/// Vector type for velocity fields
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type Vector: Copy + Send + Sync + Debug;
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/// Get velocity at a specific node/cell index
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fn get_velocity(&self, index: usize) -> CfdResult<Self::Vector>;
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/// Set velocity at a specific node/cell index
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fn set_velocity(&mut self, index: usize, velocity: Self::Vector) -> CfdResult<()>;
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/// Get pressure at a specific node/cell index
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fn get_pressure(&self, index: usize) -> CfdResult<Self::Scalar>;
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/// Set pressure at a specific node/cell index
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fn set_pressure(&mut self, index: usize, pressure: Self::Scalar) -> CfdResult<()>;
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/// Get total number of nodes/cells in the field
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fn node_count(&self) -> usize;
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/// Get temperature at a specific index (optional for thermal problems)
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fn get_temperature(&self, _index: usize) -> CfdResult<Self::Scalar> {
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// Default implementation for non-thermal problems - return zero (not implemented)
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Err(crate::error::CfdError::InvalidParameter(
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"Temperature not implemented for this field".to_string(),
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))
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}
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/// Set temperature at a specific index (optional for thermal problems)
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fn set_temperature(&mut self, _index: usize, _temperature: Self::Scalar) -> CfdResult<()> {
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// Default implementation - do nothing for non-thermal problems
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Ok(())
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}
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/// Get density at a specific index (for compressible flows)
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fn get_density(&self, _index: usize) -> CfdResult<Self::Scalar> {
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// Default implementation for incompressible flows - return error (not implemented)
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Err(crate::error::CfdError::InvalidParameter(
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"Density not implemented for this field".to_string(),
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))
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}
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/// Set density at a specific index (for compressible flows)
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fn set_density(&mut self, _index: usize, _density: Self::Scalar) -> CfdResult<()> {
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// Default implementation - do nothing for incompressible flows
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Ok(())
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}
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/// Check if all field values are finite and valid
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fn validate(&self) -> CfdResult<()> {
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for i in 0..self.node_count() {
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let _velocity = self.get_velocity(i)?;
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let _pressure = self.get_pressure(i)?;
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// Add validation logic here if needed
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}
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Ok(())
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}
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}
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/// Trait for CFD solvers (SIMPLE, PISO, LBM, etc.)
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pub trait CfdSolver: Send + Sync + Debug {
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/// Type of fluid field this solver operates on
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type Field: FluidField;
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/// Perform one solution step/iteration
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/// Returns the residual (convergence measure)
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fn solve_step(&mut self, field: &mut Self::Field, dt: f64) -> CfdResult<f64>;
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/// Check if the solution has converged
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fn is_converged(&self, residual: f64, tolerance: f64) -> bool;
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/// Get current iteration count
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fn get_iteration_count(&self) -> usize;
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/// Reset solver state for a new simulation
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fn reset(&mut self) -> CfdResult<()>;
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/// Get solver name/type for diagnostics
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fn solver_name(&self) -> &'static str {
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"Generic CFD Solver"
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}
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/// Solve until convergence or maximum iterations
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fn solve_to_convergence(
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&mut self,
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field: &mut Self::Field,
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dt: f64,
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tolerance: f64,
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max_iterations: usize,
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) -> CfdResult<(f64, usize)> {
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self.reset()?;
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for iteration in 0..max_iterations {
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let residual = self.solve_step(field, dt)?;
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if self.is_converged(residual, tolerance) {
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return Ok((residual, iteration + 1));
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}
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}
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Err(crate::error::CfdError::convergence(
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max_iterations,
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0.0, // We don't have the final residual here
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tolerance,
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))
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}
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/// Set solver parameters (optional)
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fn set_parameters(&mut self, _params: &SolverParameters) -> CfdResult<()> {
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Ok(())
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}
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}
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/// Common solver parameters
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#[derive(Debug, Clone)]
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pub struct SolverParameters {
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/// Convergence tolerance for residuals
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pub tolerance: f64,
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/// Maximum number of iterations allowed
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pub max_iterations: usize,
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/// Under-relaxation factor for stability
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pub relaxation_factor: f64,
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/// Time step size for transient simulations
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pub time_step: f64,
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}
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impl Default for SolverParameters {
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fn default() -> Self {
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Self {
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tolerance: 1e-6,
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max_iterations: 1000,
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relaxation_factor: 0.7,
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time_step: 0.001,
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}
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}
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}
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/// Trait for mesh entities (cells, faces, nodes)
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pub trait MeshEntity: Send + Sync + Debug {
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/// Unique identifier for this entity
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fn id(&self) -> usize;
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/// Number of vertices/nodes that define this entity
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fn vertex_count(&self) -> usize;
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/// Indices of vertices that define this entity
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fn vertex_indices(&self) -> &[usize];
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/// Volume (for cells) or area (for faces) or 1.0 (for nodes)
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fn volume(&self) -> f64;
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/// Geometric centroid of the entity
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fn centroid(&self) -> Vector3<f64>;
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/// Entity type (cell, face, edge, node)
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fn entity_type(&self) -> MeshEntityType {
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match self.vertex_count() {
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1 => MeshEntityType::Node,
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2 => MeshEntityType::Edge,
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3 => MeshEntityType::Triangle,
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4 => MeshEntityType::Tetrahedron,
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_ => MeshEntityType::Unknown,
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}
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}
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/// Check if this entity is on the boundary
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fn is_boundary(&self) -> bool {
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false // Default implementation
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}
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}
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/// Types of mesh entities
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum MeshEntityType {
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/// Point entity (0D)
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Node,
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/// Line entity (1D)
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Edge,
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/// Triangular face (2D)
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Triangle,
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/// Quadrilateral face (2D)
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Quadrilateral,
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/// Tetrahedral cell (3D)
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Tetrahedron,
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/// Hexahedral cell (3D)
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Hexahedron,
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/// Unknown or unsupported entity type
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Unknown,
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}
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/// Trait for boundary conditions
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pub trait BoundaryCondition: Send + Sync + Debug {
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/// Type of field this boundary condition applies to
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type Field: FluidField;
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/// Apply the boundary condition to the field
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fn apply(&self, field: &mut Self::Field, time: f64) -> CfdResult<()>;
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/// Get the boundary condition type
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fn bc_type(&self) -> BoundaryConditionType;
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/// Get the boundary patch/region this applies to
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fn boundary_patch(&self) -> &str;
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/// Validate the boundary condition
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fn validate(&self) -> CfdResult<()> {
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Ok(())
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}
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}
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/// Types of boundary conditions
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum BoundaryConditionType {
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/// Fixed velocity (Dirichlet)
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FixedVelocity,
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/// Fixed pressure (Dirichlet)
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FixedPressure,
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/// No-slip wall
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NoSlipWall,
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/// Slip wall
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SlipWall,
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/// Inlet with specified velocity
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Inlet,
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/// Outlet with specified pressure
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Outlet,
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/// Periodic boundary
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Periodic,
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/// Symmetry plane
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Symmetry,
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}
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/// Trait for time integration schemes
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pub trait TimeIntegrator: Send + Sync + Debug {
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/// Type of field this integrator works with
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type Field: FluidField;
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/// Advance the field by one time step
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fn advance(&mut self, field: &mut Self::Field, dt: f64) -> CfdResult<()>;
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/// Get the integration scheme name
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fn scheme_name(&self) -> &'static str;
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/// Get the order of accuracy
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fn order(&self) -> usize;
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/// Check if the scheme is stable for the given time step
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fn is_stable(&self, dt: f64, cfl_number: f64) -> bool;
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}
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/// Trait for turbulence models
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pub trait TurbulenceModel: Send + Sync + Debug {
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/// Type of field this model works with
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type Field: FluidField;
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/// Compute turbulent viscosity
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fn compute_turbulent_viscosity(&self, field: &Self::Field) -> CfdResult<Vec<f64>>;
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/// Update turbulence variables
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fn update(&mut self, field: &mut Self::Field, dt: f64) -> CfdResult<()>;
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/// Get the turbulence model name
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fn model_name(&self) -> &'static str;
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/// Get turbulence parameters
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fn get_parameters(&self) -> TurbulenceParameters;
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}
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/// Turbulence model parameters
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#[derive(Debug, Clone)]
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pub struct TurbulenceParameters {
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/// `C_μ` constant for k-ε model
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pub c_mu: f64,
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/// `C_ε1` constant for k-ε model
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pub c_eps1: f64,
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/// `C_ε2` constant for k-ε model
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pub c_eps2: f64,
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/// Schmidt number for turbulent kinetic energy
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pub sigma_k: f64,
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/// Schmidt number for turbulent dissipation rate
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pub sigma_eps: f64,
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}
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impl Default for TurbulenceParameters {
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fn default() -> Self {
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// Standard k-epsilon model constants
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Self {
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c_mu: 0.09,
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c_eps1: 1.44,
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c_eps2: 1.92,
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sigma_k: 1.0,
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sigma_eps: 1.3,
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_solver_parameters_default() {
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let params = SolverParameters::default();
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assert_eq!(params.tolerance, 1e-6);
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assert_eq!(params.max_iterations, 1000);
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assert_eq!(params.relaxation_factor, 0.7);
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assert_eq!(params.time_step, 0.001);
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}
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#[test]
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fn test_mesh_entity_type() {
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assert_eq!(MeshEntityType::Node as u8, 0);
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assert_ne!(MeshEntityType::Node, MeshEntityType::Edge);
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}
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#[test]
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fn test_boundary_condition_type() {
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assert_ne!(
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BoundaryConditionType::FixedVelocity,
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BoundaryConditionType::FixedPressure
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);
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}
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#[test]
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fn test_turbulence_parameters_default() {
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let params = TurbulenceParameters::default();
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assert_eq!(params.c_mu, 0.09);
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assert_eq!(params.c_eps1, 1.44);
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}
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}
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