Uniform Refinement

Uniform Refinement#

Uniform refinement creates regions of consistent mesh resolution, particularly useful for capturing off-body flow features such as wakes, shocks, and vortices, while maintaining computational efficiency in regions of uniform flow.

Available Options#

Option

Description

Spacing

Target mesh spacing in the region

Assigned boxes and cylinders

Target volumes for refinement application

Detailed Descriptions#

Spacing#

Defines the uniform mesh spacing within the refinement region.

  • Required

  • Example: 0.1 m

Note: Should be chosen based on flow feature size and resolution requirements.

Assigned boxes and cylinders#

Specifies the volumes where uniform refinement will be applied.

  • Required

Notes:

  • Must reference valid box or cylinder entities in the geometry.

  • Assign the entity by selecting from the list using the + button or select graphically in the viewer region.

💡 Tips

  • Size refinement region 10% larger than expected flow feature

  • Extend wake regions 2-3 characteristic lengths downstream

  • Align refinement with expected shock angles

  • Use \(\sqrt{3}\) times surface spacing for near-body regions

  • Consider flow direction when positioning refinement regions

❓ Frequently Asked Questions

  • How do I size uniform refinement regions?

    Consider the expected size of flow features and extend 10% beyond to ensure complete capture.

  • What happens if uniform refinements overlap?

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

🐍 Python Example Usage

 
from flow360 import UniformRefinement, u

# Wake region refinement
wake_ref = UniformRefinement(
    name="wake_region",
    entities=[wake_box],
    spacing=0.1 * u.m
)

# Shock region refinement
shock_ref = UniformRefinement(
    name="shock_region",
    entities=[shock_box],
    spacing=0.05 * u.m  # Finer spacing for shock resolution
)

# Near-body refinement
near_body_ref = UniformRefinement(
    name="near_body",
    entities=[near_body_box],
    spacing=0.02 * u.m  # √3 times surface spacing
)
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