stitchMesh seems not work

huangxianbei · September 9, 2014, 21:22

Hi, all:
I'm simulating a centrifugal pump impeller using LES. At the first step, I use single channel with periodic boundaries(design load). The result is good. Now I want to study the part load condition and use two channels. I use mergeMeshes to merge two channels together and then use stitchMesh to stitch the overlapped face. However, the result shows no difference in the two channels, while in the PIV experiment, significant rotating stall is observed. It seems that it still have a wall between the two channels so that the two channels simulate as the single channel case. How does this come from?

Xianbei

Add:::: I tried another way: I deleted the interface of two channels in ICEM and then imported to OF, so I don't need to do the above steps, however, the result turns out to be the same

huangxianbei · September 9, 2014, 21:28

A quick look at the boundaries: hub,shroud, in, out and two periodic boundaries. No excess boundaries.

Here is the geometry

And let's have a look at the velocity distribution in the two channels

obviously the two channels are the same

September 9, 2014, 21:22	stitchMesh seems not work	#1
huangxianbei Senior Member Huang Xianbei Join Date: Sep 2013 Location: Yangzhou,China Posts: 302 Rep Power: 13	Hi, all: I'm simulating a centrifugal pump impeller using LES. At the first step, I use single channel with periodic boundaries(design load). The result is good. Now I want to study the part load condition and use two channels. I use mergeMeshes to merge two channels together and then use stitchMesh to stitch the overlapped face. However, the result shows no difference in the two channels, while in the PIV experiment, significant rotating stall is observed. It seems that it still have a wall between the two channels so that the two channels simulate as the single channel case. How does this come from? Xianbei Add:::: I tried another way: I deleted the interface of two channels in ICEM and then imported to OF, so I don't need to do the above steps, however, the result turns out to be the same Last edited by huangxianbei; September 10, 2014 at 09:33.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Do all CFD analysts have to do some hands-on work except PhDs?	e13drd	Main CFD Forum	2	March 17, 2014 14:56
[mesh manipulation] stitchMesh questions	JulytoNovember	OpenFOAM Meshing & Mesh Conversion	0	December 18, 2013 01:45
[mesh manipulation] Problem with stitchMesh: it does not work in meshes with several common patches	arnau1985	OpenFOAM Meshing & Mesh Conversion	2	June 25, 2013 08:49
Why do the Plant library cases don't work?	Alumna	Phoenics	6	June 22, 2004 12:08
why my In-Form doesn't work?	green	Phoenics	2	May 27, 2004 21:03

September 9, 2014, 21:28		#2
huangxianbei Senior Member Huang Xianbei Join Date: Sep 2013 Location: Yangzhou,China Posts: 302 Rep Power: 13	A quick look at the boundaries: hub,shroud, in, out and two periodic boundaries. No excess boundaries. Here is the geometry And let's have a look at the velocity distribution in the two channels obviously the two channels are the same