Challenge

Week 3 Challenge : CFD meshing on Turbocharger

Aim:

To perform volumetric mesh of the given turbocharger model and to assign PID's required and to discuss the learning outcomes

Process:

for every model we must follow the following steps in order as

1.TOPO cleanup

initially import the given model into ANSA interface
now we can go checks>>geomentry to find out no of single and triple cons present
then we can create faces by topo>>>faces>>new to create faces or to fill holes in geomentry
then again we can check for errrors
make sure there is no single cons present and if there is any unneccessary triple cons we can get rid it of by topo>>cons>>release and then topo>>faces>>topo to convert triple cons to double cons
also in order to volumetric mesh we need to close each and every openend surface we need to create face slike inlet,outlet etc
after topo cleanup component will be as shown

2.Surface Mesh

in order to perform surface mesh we must assign PID, so click on property list and rename pid's
if there is any unwanted pid's which is not there we can delete it by suppressing it
list will be as below

then select components such as compressor casing ,turbo casing and its inlet and outlet and click show only
we need to mesh the above componenets with 5mm target length
for this mesh parameters will be 5mm target length and type will be tria
in quality criteria min and max length should be 3 and 7 mm
provide length as 5mm then spot mesh it
similiarly carry out meshing other components by given target lengths respectively
after this you can observe there is no mesh in the surfaces where two components with different mesh lengths combine, we need to get rid of it too
select the unmeshed surfaces select mesh parameters and quality criteria as required.
only thing varies is dont specify the length parameters as fixed be it in a range between two target lengths
then perform mesh then it will mesh correctly
click on macros >> cut to fine mesh the surface with varying target length

3.Volumeteric Mesh

to perform volumetric we need to make sure there is no unmeshed surfaces in components
then click on volume mesh>>define to find out no of volumes available
then we can neglect volumes which fluid will not flow or it can have metal thickness which will be the obtruction for fluid flow
the list of volumes need to mesh is as follows
then click on each volume and click on remesh tetra cfd and click on ok
following this we can mesh all the volumes
if we remove elements randamly it will be as follows
we can obseve that the mesh elements are is shape of pyramid
if we anlayse in shaft rotor area we can observe there is variation in sizes of each and every mesh

Result:

Thus volumetric mesh of the given turbo charger model is done and process is discussed

Ship work like this
in your own course.