[snappyHexMesh] Different mesh on exact same geometry

erickmartinez · August 5, 2021, 20:13

Hi all,

I am trying to use SHM for a Darrieus-type water turbine (Shown in first image). The turbine has three different 3D hydrofoil sets connected by shafts. One of the shafts connected to the hydrofoils has a really good mesh conformed by only hexahedral cells (Seen in second image), but the other two shafts have entirely different meshes conformed by polyhedral cells despite having the same surface shown on the STL file (Bottom of images 2 and 3).
Does anyone know why this might happen? I would like to have all the shafts have the same mesh as the first one shown. Let me know if anyone has any tips.

Thanks in advance!

dybuk · August 6, 2021, 01:14

Geometry is the same but aligment with background grid is different. The shaft with only hex cells is aligned with the X axis and background grid lines. Two shafts with polyhedral cells cuts the background grid lines with 30 deg angle.

August 6, 2021, 01:14		#2
dybuk Member W.T Join Date: Oct 2012 Posts: 35 Rep Power: 13	Geometry is the same but aligment with background grid is different. The shaft with only hex cells is aligned with the X axis and background grid lines. Two shafts with polyhedral cells cuts the background grid lines with 30 deg angle. rmaries likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[snappyHexMesh] non uniform mesh near the stl object	vava10	OpenFOAM Meshing & Mesh Conversion	0	January 31, 2021 14:41
[snappyHexMesh] High quality mesh for wind in complex urban environment	ziboaa	OpenFOAM Meshing & Mesh Conversion	1	January 12, 2021 15:33
how to set periodic boundary conditions	Ganesh	FLUENT	15	November 18, 2020 06:09
[snappyHexMesh] No layers in a small gap	bobburnquist	OpenFOAM Meshing & Mesh Conversion	6	August 26, 2015 09:38
[snappyHexMesh] snappyHexMesh won't work - zeros everywhere!	sc298	OpenFOAM Meshing & Mesh Conversion	2	March 27, 2011 21:11