From b81fa4f4c6693f5ab6321474edb73077e094515b Mon Sep 17 00:00:00 2001 From: piotrkluba Date: Mon, 26 Jan 2026 10:47:38 +0000 Subject: [PATCH] fix to the tips and the note --- .../01.boundary-conditions/05.periodic.md | 28 +++++++++---------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/docs/02.simulation-setup/03.flow-solver/01.boundary-conditions/05.periodic.md b/docs/02.simulation-setup/03.flow-solver/01.boundary-conditions/05.periodic.md index e953e1d..eb26c93 100644 --- a/docs/02.simulation-setup/03.flow-solver/01.boundary-conditions/05.periodic.md +++ b/docs/02.simulation-setup/03.flow-solver/01.boundary-conditions/05.periodic.md @@ -41,26 +41,27 @@ - **Required.** - **Accepted types:** Pairs of Surface objects - **Example:** `front_plane AND back_plane` ->**Note:** Flow360 handles the interpolation between periodic surfaces automatically, regardless of mesh topology. +>**Note:** The mesh must be conformal at periodic interfaces, meaning nodes on paired surfaces must match exactly after applying the periodic transformation. ---

💡 Tips

 -### Mesh Preparation for Periodic Boundaries +**Mesh Preparation for Periodic Boundaries** + +- **Conformal mesh requirement:** + - The mesh must be conformal at periodic interfaces + - Nodes on paired surfaces must match exactly after applying the periodic transformation (translation or rotation) + - Ensure your mesh generator creates matching node distributions on both periodic surfaces - **For Translational Periodicity:** - - Periodic surfaces should have similar (but not necessarily identical) mesh resolution - - Flow360 automatically handles the interpolation between periodic surfaces - - No exact node matching is required between periodic pairs + - Ensure identical node positions on both surfaces, offset only by the translation vector - **For Rotational Periodicity:** - - Similar mesh resolution is recommended along the periodic interfaces - - Flow360 automatically handles the rotational transformation - - For best results, maintain similar element sizes across interfaces + - Ensure nodes on both surfaces match exactly when one surface is rotated to align with the other -### Common Applications +**Common Applications** - **Translational Periodicity:** - Airfoil or blade cascades @@ -95,11 +96,10 @@ > - The problem has no major asymmetries that would invalidate the periodic assumption - **What mesh requirements must be met for periodic boundaries?** - > Flow360 is very flexible with periodic interfaces: - > - Non-matching meshes are fully supported through automatic interpolation - > - No specific node count or distribution requirements exist - > - Similar mesh resolution is recommended (but not required) at interfaces for best accuracy - > - Both conformal and non-conformal interfaces are supported + > Periodic boundaries require conformal meshes: + > - Nodes on paired surfaces must match exactly after applying the periodic transformation + > - The node count must be identical on both periodic surfaces + > - Ensure your mesh generator creates matching node distributions when generating periodic boundaries - **Can I use periodicity with other boundary conditions?** > Yes, periodic boundaries are often combined with: