<![CDATA[CFD Online Discussion Forums - Ansys Meshing & Geometry]]>

<![CDATA[CFD Online Discussion Forums - Ansys Meshing & Geometry]]> http://www.cfd-online.com/Forums/ Discussions about GAMBIT, ICEM, TGrid, AI*Environment and other meshing and geometry tools from ANSYS. en Thu, 09 Sep 2010 09:25:41 GMT vBulletin 60 http://www.cfd-online.com/Forums/images/misc/rss.jpg <![CDATA[CFD Online Discussion Forums - Ansys Meshing & Geometry]]> http://www.cfd-online.com/Forums/ <![CDATA[[ICEM] prism element on interface]]> http://www.cfd-online.com/Forums/ansys-meshing/79944-prism-element-interface.html Thu, 09 Sep 2010 03:05:35 GMT prism element creation on fluid-fluid interface is good practice or not? pls explain. prism element creation on fluid-fluid interface is good practice or not?
pls explain. ]]> jai http://www.cfd-online.com/Forums/ansys-meshing/79944-prism-element-interface.html <![CDATA[[ICEM] Hybrid mesh]]> http://www.cfd-online.com/Forums/ansys-meshing/79933-hybrid-mesh.html Wed, 08 Sep 2010 18:01:19 GMT Hi, everybody. I want to generate a hybrid mesh which is comprised of hexahedra and quad-surface mesh. The computation domain is two... Hi, everybody.

I want to generate a hybrid mesh which is comprised of hexahedra and quad-surface mesh. The computation domain is two dimension, and 2D hexahedra mesh is used in region near the wall. The left domain is filled of quad-surface mesh.

But, I just know how to generate the quad-surface mesh using surface-mesher for 2D compute domain. I don't know how to generate a hybird mesh in which near wall region is replaced by 2D hexahedra mesh.

Anyone could help me?
Thanks. ]]> ringtail http://www.cfd-online.com/Forums/ansys-meshing/79933-hybrid-mesh.html How I could import Ansys mesh into CFX? http://www.cfd-online.com/Forums/ansys-meshing/79898-how-i-could-import-ansys-mesh-into-cfx.html Wed, 08 Sep 2010 08:43:17 GMT Dears,

I wanna import ansys mesh into CFX (I have ansys 12). I can import the mesh, but I can't define the boundary condition, because CFX consider whole geometry as a block. Could u plz help me?

m.shahverdi@gmail.com ]]> mahdi57 http://www.cfd-online.com/Forums/ansys-meshing/79898-how-i-could-import-ansys-mesh-into-cfx.html <![CDATA[[ICEM] Extracting point data from a spline or curve]]> http://www.cfd-online.com/Forums/ansys-meshing/79889-extracting-point-data-spline-curve.html Tue, 07 Sep 2010 21:05:27 GMT Here's my question folks, I have a curve or spline and I have placed points on at various intervals, is there anyway I can write a macro which would id each point and print it to a text file? Any thoughts would be appreciated. ]]> sherifkadry http://www.cfd-online.com/Forums/ansys-meshing/79889-extracting-point-data-spline-curve.html read two mesh in fluent http://www.cfd-online.com/Forums/ansys-meshing/79872-read-two-mesh-fluent.html Tue, 07 Sep 2010 12:16:53 GMT hi everybody, I want to import 2 meshes differently at the same time into one case. Is there any special option to do this? hi everybody,

I want to import 2 meshes differently at the same time into one case. Is there any special option to do this? ]]> bugra http://www.cfd-online.com/Forums/ansys-meshing/79872-read-two-mesh-fluent.html <![CDATA[[ICEM] Create a region]]> http://www.cfd-online.com/Forums/ansys-meshing/79862-create-region.html Tue, 07 Sep 2010 07:48:57 GMT Dear All, Who has any effective methods if I would like to create a circle region (pointed by an arrow in Fig. 1) connected with the wall? A... Dear All,
Who has any effective methods if I would like to create a circle region (pointed by an arrow in Fig. 1) connected with the wall? A simplification diagram is shown in Fig. 2. Thank you very much.
Best Regards,
C. H. Lin
Sep. 7, 2010

Attached Files

Dear all.pdf (67.5 KB)

]]> nchuche http://www.cfd-online.com/Forums/ansys-meshing/79862-create-region.html <![CDATA[[ICEM] replay file with different geometry]]> http://www.cfd-online.com/Forums/ansys-meshing/79855-replay-file-different-geometry.html Tue, 07 Sep 2010 06:17:52 GMT Dear all, I created the geometry of a pump rotor in ProE, copy/paste to get the surface all in one, added this surface to a layer and exported... Dear all,

I created the geometry of a pump rotor in ProE, copy/paste to get the surface all in one, added this surface to a layer and exported this surface to a tetin file.

The attributed surface mesh in the recorded ICEM-replay file looks like

ic_set_meshing_params surface {ROTOR/2842 ROTOR/2841 ROTOR/2840)

As u can see, the rotor still consists of several surfaces.

Is there a possibility to get the surface mesh attributed to the part ROTOR which shows up in the ICEM model tree and independent from the ROTOR/xy ??

Thank you for your help!
cheers, martin ]]> marting http://www.cfd-online.com/Forums/ansys-meshing/79855-replay-file-different-geometry.html <![CDATA[[ICEM] Geometric density sources in ICEM]]> http://www.cfd-online.com/Forums/ansys-meshing/79849-geometric-density-sources-icem.html Mon, 06 Sep 2010 15:46:49 GMT Hi, I had been working on a combustor mesh and I wanted to have a conical density source in the flame region where coal particles enter into the... Hi,

I had been working on a combustor mesh and I wanted to have a conical density source in the flame region where coal particles enter into the furnace.
After trying several different approaches,( ICEM manual/tutorial doesn't cover this topic nicely) Simon Pereira helped me with a very easy solution. I thought it might be helpful to share with others, so here is what he suggested.

"First, create points... In my case, I started with 4 points (the mid points between the center of one face and the "corners" of the other) and then copy/rotated them to get a circle of points, but how you create them is up to you. Then I created my density from points and selected all these points to create my density region. I set the max size within the density to 4, the rest of the cylinder was set to 16. Then I meshed.

Tada!

Pictured are attached. Good luck with your model.

Note, if you wanted something like a hollow cone or a torus, you could create one section of it and then copy rotate the density zone (just like other geometry entities). They can overlap without causing any problems and you can "add" up any combination of density lines, points, boxes or copies of density zones to get any final zone shape. The smallest max size wins within its respective zone. "

Attached Images

	DensityFromPoints_01.jpg (66.1 KB)
	DensityFromPoints_02.jpg (83.8 KB)
	DensityFromPoints_Cone_01.jpg (41.0 KB)
	DensityFromPoints_Cone_02.jpg (42.0 KB)
	DensityFromPoints_Cone_03.jpg (80.3 KB)

]]> rana41671 http://www.cfd-online.com/Forums/ansys-meshing/79849-geometric-density-sources-icem.html <![CDATA[[GAMBIT] gambit fatal error]]> http://www.cfd-online.com/Forums/ansys-meshing/79848-gambit-fatal-error.html Mon, 06 Sep 2010 14:55:22 GMT Hi everybody,

while I'm meshing volume, a fatal error occurs an closing gambit. by increasing surface mesh size, I could create the volume without problem. but, after I generated it , when I tried to save, again it gives fatal error, is there anybody to say how to solve this problem?

so, the total mesh size is quite big and I'm working at a cluster.

thanks. ]]> bugra http://www.cfd-online.com/Forums/ansys-meshing/79848-gambit-fatal-error.html mesh generation from .vol file http://www.cfd-online.com/Forums/ansys-meshing/79832-mesh-generation-vol-file.html Mon, 06 Sep 2010 08:45:33 GMT hallo,

i am relatively new to CFD and meshing...
By now I am going through the User's Guide and practicing all day :D

I also installed the programs NetGen and Engrid.
With both of them i tried to open a .vol file, which made them crash :(

the .vol is a seal's vibrissae (beard hair), which has been scanned by a scientific machine/computer.
It consists of many .tif files, which in sum create the .vol file after merging.

I have no idea how to open or mesh it for some flow calculation :eek:

Could someone please help me?

Thank you very much in forecast.

Greetings

RugbyGandalf ]]> RugbyGandalf http://www.cfd-online.com/Forums/ansys-meshing/79832-mesh-generation-vol-file.html <![CDATA[[TGrid] Inlet passage in turbogrid.]]> http://www.cfd-online.com/Forums/ansys-meshing/79819-inlet-passage-turbogrid.html Sun, 05 Sep 2010 15:34:18 GMT Greetings. Im doing a single stage simulation under cavitation of a centrifugal pump, in fact, i am only simulating one blade passage. i have had a... Greetings. Im doing a single stage simulation under cavitation of a centrifugal pump, in fact, i am only simulating one blade passage. i have had a little bit of trouble on turbogrid, i want the inlet of the passage to be as far away of the blade as possible (meaning, on the very inlet of the impeller). I have imported the curves from Cfturbo 5.0. When i click on the option "Initialize points to full extents of Hub curve ", and then proceed to generate the passage, the following error appears

ERROR
The hub radius at the inlet of the blade passage is too small. Try moving the blade passage inlet closer to the blade.

the geometry of the blade passage is the following
Attachment 4605
and as you can see, that is the place where i want the inlet to be, and also where i am having the error message.

so my question is, how can i fix this error without moving too much the inlet from where i want it to be? right now i have ran the simulation without that option, and the default inlet surface is insside the passage near the blade, but i want to study the flow from the very inlet of the impeller. This is for my thesis, so i would really ppreciate any help. Thanks

Attached Images

Snap1.jpg (41.8 KB)

]]> soldimix15 http://www.cfd-online.com/Forums/ansys-meshing/79819-inlet-passage-turbogrid.html <![CDATA[[GAMBIT] Wind tunnel modelling]]> http://www.cfd-online.com/Forums/ansys-meshing/79817-wind-tunnel-modelling.html Sun, 05 Sep 2010 14:09:43 GMT Hi I have to simulate the flow around a tanker-truck (road tanker) to test the aerodynamic drag of the type of trucks currently used. I have... Hi

I have to simulate the flow around a tanker-truck (road tanker) to test the aerodynamic drag of the type of trucks currently used. I have modelled the trucks geometry in ProEngineer Wildfire4 and exported it to GAMBIT. I have no problems when exporting the geometry from ProEngineer to GAMBIT. But i do not know how to model the wind tunnel needed to do the simulations. Please help me with this wind tunnel modeling. Links to tutorials on this subject is also welcome.

Thank you

uthman ]]> uthman http://www.cfd-online.com/Forums/ansys-meshing/79817-wind-tunnel-modelling.html <![CDATA[[ICEM] Proper way to name boundaries on 2D model for use in CFX?]]> http://www.cfd-online.com/Forums/ansys-meshing/79815-proper-way-name-boundaries-2d-model-use-cfx.html Sun, 05 Sep 2010 11:20:08 GMT I'm trying to mesh a fairly simple structure in 2D (2.5D for CFX) for use in ANSYS CFX in ICEM CFD as the mesher in ANSYS workbench is not giving me the control I need when refining the mesh.

PSYMN has suggested that the easiest way to generate a 2.5D model in ICEM CFD for ANSYS CFX is to generate a 2D mesh and export it in Fluent format. To name locations of the boundaries you just convert the curves (edges) of the mesh into parts. The name and locations of the parts are carried through to ANSYS CFX when importing the mesh file. The problem with doing this however is that it will not give me a part/location for the front *and* rear plane of symmetry (I need to set up symmetry bocos on the "front" and "back" of the mesh in CFX right?) in CFX setup. Is there a work around for this?

-----------
Otherwise, I tried making a 2D mesh and extruding it 1 cell thick. I then made parts out of all the nodes in the relevant locations. This however generates warnings about having parts made up of 2D and 3D elements which isn't allowed in CFX 5. The mesh will import into CFX and the locations I want turn up, but a bunch of stuff I didn't intend to generate seems to come through as well.
What is a better way of setting up the locations (parts) for bocos ?
Generating a surface in the same location as the edges of the nodes I want to select and generating a part from this doesn't appear to generate a location that will transfer into CFX. ]]> RossFS http://www.cfd-online.com/Forums/ansys-meshing/79815-proper-way-name-boundaries-2d-model-use-cfx.html <![CDATA[[ICEM] o-grid help]]> http://www.cfd-online.com/Forums/ansys-meshing/79812-o-grid-help.html Sun, 05 Sep 2010 07:38:07 GMT Actually, I want to create a c-grid. Conventionally, the C-grid can be created through a O-grid with a face attached. However, my situation is... Actually, I want to create a c-grid. Conventionally, the C-grid can be created through a O-grid with a face attached. However, my situation is annoying, shown in the attachment (simplified). Specifically speaking, i want to create the C-grid in the left part with the right part intact.

please give me some advices or strategies! thanks a lot!

Attached Images

pp.jpg (4.7 KB)

]]> edwardhep http://www.cfd-online.com/Forums/ansys-meshing/79812-o-grid-help.html uncovered faces and hanging elements found http://www.cfd-online.com/Forums/ansys-meshing/79811-uncovered-faces-hanging-elements-found.html Sun, 05 Sep 2010 05:16:04 GMT My mesh is a simple 2-D rectangle with a hole in the center. I am using a All Tri, patch dependent mesh. I am getting the following error. 4... My mesh is a simple 2-D rectangle with a hole in the center. I am using a All Tri, patch dependent mesh. I am getting the following error.

4 uncovered faces found.
2 hanging elements found.

How do I solve this problem ??? ]]> vmlxb6 http://www.cfd-online.com/Forums/ansys-meshing/79811-uncovered-faces-hanging-elements-found.html