# Axisymmetric Refinement

Axisymmetric refinement creates structured-like mesh with cylindrical bias, ideal for rotating machinery, propellers, and axisymmetric flow features, providing optimal resolution for circumferential and radial flow patterns.

# 📋 Available Options

Option Description Unit
spacing_axial Mesh spacing along cylinder axis length (e.g. m)
spacing_radial Mesh spacing in radial direction length (e.g. m)
spacing_circumferential Mesh spacing in circumferential direction length (e.g. m)
entities Target cylindrical regions for refinement -

# 🔍 Detailed Descriptions

# Spacing Axial

Defines the mesh spacing along the cylinder axis.

  • Default: None (required)
  • Example: 0.02 * u.m
  • Notes: Critical for capturing axial flow features and gradients

# Spacing Radial

Specifies the mesh spacing in the radial direction.

  • Default: None (required)
  • Example: 0.01 * u.m
  • Notes: Important for resolving radial flow patterns and boundary layer development

# Spacing Circumferential

Controls the mesh spacing in the circumferential direction.

  • Default: None (required)
  • Example: 0.015 * u.m
  • Notes: Essential for capturing rotational effects and circumferential variations

# Entities

Identifies the cylindrical regions where axisymmetric refinement will be applied.

  • Default: None (required)
  • Example: [propeller_region, rotor_region]
  • Notes: Must reference valid cylinder entities in the geometry

💡 Tips
  • Match circumferential and radial spacing for optimal quality
  • Use 20+ axial layers for strong gradients
  • Consider tip Mach number for propeller applications
  • Ensure sufficient resolution for tip vortices
  • Balance resolution with computational cost

❓ Frequently Asked Questions

  • How do I choose appropriate circumferential spacing?

    Consider the number of blades, tip Mach number, and desired resolution level (coarse/medium/fine).

  • What happens if axisymmetric refinements overlap?

    The finest (smallest) spacing will be applied in overlapping regions.

🐍 Python Example Usage

 
from flow360 import AxisymmetricRefinement, u

# Propeller region refinement
prop_ref = AxisymmetricRefinement(
    name="propeller_region",
    entities=[prop_cylinder],
    spacing_axial=0.02 * u.m,
    spacing_radial=0.01 * u.m,
    spacing_circumferential=0.015 * u.m
)

# High-resolution rotor region
rotor_ref = AxisymmetricRefinement(
    name="rotor_region",
    entities=[rotor_cylinder],
    spacing_axial=0.01 * u.m,  # Finer for better gradient resolution
    spacing_radial=0.005 * u.m,  # Finer for tip vortex capture
    spacing_circumferential=0.01 * u.m  # Finer for better circumferential resolution
)

← Reference Geometry →