-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Tutorial on 2d hybrid meshing in ICEM CFD for 2d airfoil
1. Objective: To make the hybrid mesh in ICEM CFD for an
airfoil.
2. Learning objectives:
To make the hexa mesh in vicinity of airfoil Tetra mesh (patch
dependent) in outer domain with conformal mesh at
boundary Merging of two meshes. Here two methods are given for
better understand of
process. Exporting mesh and importing in Fluent and sample
solution
3. Importing geometry Geometry is available in formatted .dat
format
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Airfoil
Interfaceboundary
Fairfield
Pressureoutlet
Then I added smaller far field boundary (interface between hexa
and tetra mesh, called interfacecurves) and scaled it to get the
outer most boundary (called far field) . Faces were also made and
after that I run build topology to segment surfaces automatically.
I have also deleted inner most surface(inside airfoil).
.
Outerdomainmeshingwithtetra
innerdomainmeshingwithhexablocking
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Set these parameters in part mesh setup
After that 2d planner block is created as shown in Fig. After
usual processing C-type blocking was made and mesh was converted to
unstructured mesh
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Now update mesh sizes for blocking and specially at boundary of
inner mesh which will be used for the outer mesh.
Now create pre-mesh and check the mesh for any error.
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Mesh will look like as follows.
Convert to unstructured mesh
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Now hide inner domain from model tree. Also turn on surfaces so
that we can pick outer surface/domain while meshing. This tetra
mesh will be merged with previously created hexa mesh.
Method selected is patch dependent mesh and All Tri. Also check
Respect line elements. This is necessary since at interface we need
same mesh on both sides.
Since we have already defined mesh sizes for all parts (surfaces
and curves).
Now go to compute mesh panel (surface mesh, first option from
left) and choose visible option for input.
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Mesh looks like as shown in following Fig.
Now turn-on the inner mesh also (Hexa one)
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
You can notice two colors for mesh inside and outside. This is
due to fact that both meshes are in different part.
First step in merging 2d meshes is to make single part for both
meshes. For this right click on outer part model tree,
Now you see both meshes are combined together. But if you export
mesh without doing this you will get wall between both domains
(inner and outer).
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Method one defining interior boundary condition for
interfacecurves and output mesh.
Interfacecurves
Farfield
intisaddedbyICEM
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
When I simulated this case in Fluent, results are not different
than the case without the interior boundary.
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Method two Deleting line elements in interface zone. There are
two methods to do this
a) delete the interface part (assuming you have separate part
for the interfacecurves, which we have).
Go to Geometry > delete curves and choose part which contains
the interfacecurves
No export mesh from ICEM and import into Fluent
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Results are :
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Method three Deleting interface elements when you have not
defined separate part for interfacecurves
In this case disable all other elements type and only leave the
line elements.
Lineelementsareselectedininterfaceregion.
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
.
-
+923215096447
Copyrightbyhttp://cfdconsultancy.webs.com/[email protected]
Summary:
1. We have learned how to tackle the hybrid 2d mesh in ICEM CFD.
2. It should be noted that the hybrid meshing for 3d cases is
different than 2d. I will
show it in separate tutorial. 3. We have discussed three methods
to make hybrid mesh. 4. All files at each stage are also included
in package.