[blockMesh] SimpleSpline problem

anon_r · December 4, 2008, 09:10

Hi,

a little tip:

replace the "simpleSpline" with "polySpline". add the start and end vector and afterwards a ";".

It must look like this:
================================
polySpline 2 14
(
(point1)
(point2)
(point3)
)
(0 0 0) (0 0 0);
===============================

blockMesh it. there will be an error. but it writes you the points out, that the polySpline would want to have. copy-paste them into blockMeshDict and replace the "polySpline" no with a "polyLine".
...maybe this is accurate enough for you.

I personally thin, there still is a bug in the polyLine. But till it is solved maybe you come along with my idea.

Greetz.

demichie · December 9, 2008, 05:31

Thank you.
I will try with following your tip.

Mattia

kokashking · November 6, 2009, 10:49

Hallo

as I understood, there are some problems with simpleSpline in openFOAM 1.5 too.

with simpleSpline I got good shape, but the grid of cells is wrong. (i have also tried to change simpleGrading)

then I have made this trick with polySpline error and got a normal grid.

But for my algorithm use of this trick, that is based or error, is not the best way.
So I have a question to the people, who have more experience with openFOAM.

Can I solve this problem with blockMesh, OF 1.6 or it's better to use some others pre-processors like Gmsh?

TIA

Ivan

simpleSpline.jpg

polyLine.jpg

blockMeshDict_simpleSpline.txt

ericnutsch · December 10, 2009, 20:20

I have run into the same problem, and haven't gotten to far in the other threads either:
http://www.cfd-online.com/Forums/ope...-commands.html
http://www.cfd-online.com/Forums/ope...g-airfoil.html

I am going to attempt to use gmsh. I was previously going to use netgen, but it cant regulate the cell size properly for cfd(good for FEA just not CFD).

Good Luck!

December 4, 2008, 09:10	SimpleSpline problem	#1
anon_r Disabled Join Date: Mar 2009 Posts: 136 Rep Power: 22	Hi, a little tip: replace the "simpleSpline" with "polySpline". add the start and end vector and afterwards a ";". It must look like this: ================================ polySpline 2 14 ( (point1) (point2) (point3) ) (0 0 0) (0 0 0); =============================== blockMesh it. there will be an error. but it writes you the points out, that the polySpline would want to have. copy-paste them into blockMeshDict and replace the "polySpline" no with a "polyLine". ...maybe this is accurate enough for you. I personally thin, there still is a bug in the polyLine. But till it is solved maybe you come along with my idea. Greetz.

December 9, 2008, 05:31	Thank you. I will try with f	#2
demichie Member Mattia de\' Michieli Vitturi Join Date: Mar 2009 Posts: 51 Rep Power: 18	Thank you. I will try with following your tip. Mattia

November 6, 2009, 10:49	Hmm...	#3
kokashking New Member Ivan Golod Join Date: Nov 2009 Posts: 3 Rep Power: 18	Hallo as I understood, there are some problems with simpleSpline in openFOAM 1.5 too. with simpleSpline I got good shape, but the grid of cells is wrong. (i have also tried to change simpleGrading) then I have made this trick with polySpline error and got a normal grid. But for my algorithm use of this trick, that is based or error, is not the best way. So I have a question to the people, who have more experience with openFOAM. Can I solve this problem with blockMesh, OF 1.6 or it's better to use some others pre-processors like Gmsh? TIA Ivan simpleSpline.jpg polyLine.jpg blockMeshDict_simpleSpline.txt

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December 10, 2009, 20:20		#4
ericnutsch Senior Member Eric Nutsch Join Date: Sep 2009 Location: Eugene, Oregon USA Posts: 113 Rep Power: 18	I have run into the same problem, and haven't gotten to far in the other threads either: http://www.cfd-online.com/Forums/ope...-commands.html http://www.cfd-online.com/Forums/ope...g-airfoil.html I am going to attempt to use gmsh. I was previously going to use netgen, but it cant regulate the cell size properly for cfd(good for FEA just not CFD). Good Luck!