Initial commit

2026-03-04 00:08:42 +00:00
commit 4d88dc0584
4449 changed files with 1556714 additions and 0 deletions
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+// Mesh refinement algorithms
+
+use crate::error::{CfdError, CfdResult};
+
+/// Refinement strategy
+#[derive(Debug, Clone, Copy)]
+pub enum RefinementStrategy {
+    /// Uniform refinement - refine all cells
+    Uniform,
+    /// Adaptive refinement based on error indicators
+    Adaptive,
+    /// Refine specific regions
+    Regional,
+}
+
+/// Refinement criteria
+#[derive(Debug, Clone)]
+pub struct RefinementCriteria {
+    /// Maximum allowed error per cell
+    pub max_error: f64,
+    /// Minimum cell size
+    pub min_cell_size: f64,
+    /// Maximum cell size
+    pub max_cell_size: f64,
+    /// Maximum refinement levels
+    pub max_levels: usize,
+}
+
+impl Default for RefinementCriteria {
+    fn default() -> Self {
+        Self {
+            max_error: 1e-3,
+            min_cell_size: 1e-6,
+            max_cell_size: 1e6,
+            max_levels: 10,
+        }
+    }
+}
+
+/// Adaptive mesh refinement implementation
+pub struct AdaptiveRefinement {
+    criteria: RefinementCriteria,
+    current_level: usize,
+}
+
+impl AdaptiveRefinement {
+    /// Create new adaptive refinement
+    #[must_use]
+    pub fn new(criteria: RefinementCriteria) -> Self {
+        Self {
+            criteria,
+            current_level: 0,
+        }
+    }
+
+    /// Check if refinement is needed
+    #[must_use]
+    pub fn needs_refinement(&self, error: f64, cell_size: f64, current_level: usize) -> bool {
+        error > self.criteria.max_error
+            && cell_size > self.criteria.min_cell_size
+            && current_level < self.criteria.max_levels
+    }
+
+    /// Mark cells for refinement based on error indicators
+    pub fn mark_cells_for_refinement(
+        &self,
+        errors: &[f64],
+        cell_sizes: &[f64],
+        cell_levels: &[usize],
+    ) -> CfdResult<Vec<usize>> {
+        if errors.len() != cell_sizes.len() || errors.len() != cell_levels.len() {
+            return Err(CfdError::mesh(
+                "Error, cell size, and level arrays must have same length",
+            ));
+        }
+
+        let mut marked_cells = Vec::new();
+
+        for (i, (&error, (&size, &level))) in errors
+            .iter()
+            .zip(cell_sizes.iter().zip(cell_levels.iter()))
+            .enumerate()
+        {
+            if self.needs_refinement(error, size, level) {
+                marked_cells.push(i);
+            }
+        }
+
+        Ok(marked_cells)
+    }
+
+    /// Compute gradient-based error indicator
+    pub fn compute_gradient_error_indicator(
+        &self,
+        velocity_field: &[nalgebra::Vector3<f64>],
+    ) -> CfdResult<Vec<f64>> {
+        let mut errors = Vec::with_capacity(velocity_field.len());
+
+        for velocity in velocity_field {
+            // Use velocity magnitude as a simple gradient indicator
+            // In practice, this would be computed from actual velocity gradients
+            let error = velocity.magnitude();
+            errors.push(error);
+        }
+
+        Ok(errors)
+    }
+
+    /// Compute residual-based error indicator
+    pub fn compute_residual_error_indicator(
+        &self,
+        momentum_residuals: &[f64],
+        continuity_residuals: &[f64],
+    ) -> CfdResult<Vec<f64>> {
+        if momentum_residuals.len() != continuity_residuals.len() {
+            return Err(CfdError::mesh(
+                "Momentum and continuity residual arrays must have same length",
+            ));
+        }
+
+        let mut errors = Vec::with_capacity(momentum_residuals.len());
+
+        for (&mom_res, &cont_res) in momentum_residuals.iter().zip(continuity_residuals.iter()) {
+            // Combine momentum and continuity residuals using L2 norm
+            let combined_error = (mom_res * mom_res + cont_res * cont_res).sqrt();
+            errors.push(combined_error);
+        }
+
+        Ok(errors)
+    }
+}