[snappyHexMesh] wigley hull tutorial-no snapped faces

Dr.Faustus · July 11, 2012, 11:21

Hi to everybody,
i'm a rookie with openfoam at very first attempt...
i've some problem with snappy mesher: i've followed this tutorial:http://www.hydroniumion.de/general/s...mesh-tutorial/

andi've reached after various loop of debugging the latter steps... the only problem is that snappyhexmesh doesn't snap the face on the grid... so there's few difference between mesh at time 1 and mesh and time 2.

i've attached a screenshot to clarify the problem..

i've turned off all of meshQualityControls
Any idea?
Thanks

SirWombat · July 12, 2012, 05:08

Hi Allessandro

hard to tell as the link that you posted doesn't seem to work and i couldn't find the corresponding thread in the forum.

As for your SHMDict: that looks good and should actually work.

But here's a guess: In you SHMDict you put

Code:

maxGlobalCells 2000000;

and that will allow SHM to generate a maximum of 2 Mio. cells.

Have a close look at the output of snappyHexMesh whether or not it tells you that the "overall cell limit ist reached"

Otherwise attach the output of snappyHexMesh so we can have a look

You can do that by redirecting the output with ">" to a file, e.g.

Code:

 snappyHexMesh > snappy.log

Or if you need to see the output while SHM is running, use "tee"

Code:

 snappyHexMesh | tee snappy.log

Dr.Faustus · July 12, 2012, 05:49

Sorry for the link.... now it's correct..
here i post the snappy.log
i'm going to try some changes and than see what happens

UPDATE
after some changes i am able to obtain the level of snapping shown in attached screenshot

but now the timesteps are 4

SirWombat · July 12, 2012, 09:36

Hi Allessandro,

i tried your SHMDict with the wigley-hull-tutorial and it works just fine. I even changed blockMesh to only half the domain as shown in your screenshot.

As the mesh is little too large i had to change the following line to keep the cells under 2Mio. I left everything else unchanged.

Code:

refinementRegions { hull { mode distance; levels ((0.1 3) (0.4 2) (1 1)); } }

See screenshot attached.

The only difference I found is the version: You are using OpenFOAM 2.0.1 ... where I'm using 2.1.0 ...

So if you can try to change to OpenFoam 2.1.0.

Hope it's that simple!

Dr.Faustus · July 12, 2012, 11:25

Quote:

Originally Posted by SirWombat

Hi Allessandro,

The only difference I found is the version: You are using OpenFOAM 2.0.1 ... where I'm using 2.1.0 ...

So if you can try to change to OpenFoam 2.1.0.

Hope it's that simple!

Hahah many thanks ^______________^ whith the 2.1.1 works well

July 12, 2012, 05:08		#2
SirWombat Member Jan Join Date: Dec 2009 Location: Berlin Posts: 50 Rep Power: 19	Hi Allessandro hard to tell as the link that you posted doesn't seem to work and i couldn't find the corresponding thread in the forum. As for your SHMDict: that looks good and should actually work. But here's a guess: In you SHMDict you put Code: maxGlobalCells 2000000; and that will allow SHM to generate a maximum of 2 Mio. cells. Have a close look at the output of snappyHexMesh whether or not it tells you that the "overall cell limit ist reached" Otherwise attach the output of snappyHexMesh so we can have a look You can do that by redirecting the output with ">" to a file, e.g. Code: snappyHexMesh > snappy.log Or if you need to see the output while SHM is running, use "tee" Code: snappyHexMesh \| tee snappy.log __________________ ~~~_/)~~~

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
parallel run OpenFoam	Srinath Reddy	OpenFOAM Running, Solving & CFD	13	February 27, 2019 10:15
[OpenFOAM.org] OF2.3.1 + OS13.2 - Trying to use the dummy Pstream library	aylalisa	OpenFOAM Installation	23	June 15, 2015 15:49
Compressor Simulation using rhoPimpleDyMFoam	Jetfire	OpenFOAM Running, Solving & CFD	107	December 9, 2014 14:38
createPatch Segmentation Fault (CORE DUMPED)	sam.ho	OpenFOAM Pre-Processing	2	April 21, 2014 03:01
DecomposePar unequal number of shared faces	maka	OpenFOAM Pre-Processing	6	August 12, 2010 10:01