Week 2 Challenge : Surface meshing on a Pressure valve

AIM:

• The surface meshing on a pressure valve by solving the geometrical errors and topology cleanup accordingly with a different target length and element type.

Procedure:

• Open ANSA software and enable labels to show the tool's name.
• Import geometry from file->open->file location->challenge2.ansa
• After importing the geometry change ENT mode to PID mode for better usage.
• Enable shadow option for the visibility of the geometry surface.

• By disabling the shadow option, double cons, triple cons, and cross hatches we can find the single cons easily.

• By clicking the ctrl+shift option, The geometry will show like this.
• The unfinished surface's/red con (holes) will be created newly or by the fill hole option.
• Always check before creating the surface by middle click and make sure which option is perfect for the cons.
• Here the surface is created newly with the following sequence TOPO->FACES->NEW->COONS->LOOP->SELECT THE SURFACE and give OK.

• After creating the surface.

• The same sequence has been followed here to create the surface.

• Checking the surface model before creating.

• Used Fill Hole option, Because if we use a new surface here that will make unwanted cross hatches.

• Both Fill Hole and New options will be suitable to create the surface here.

• This is the best example and difference between the New and Fill Hole option.
• In the small red con creating a new surface is a good option but if we see the below red con creating the new surface is not a good option. So instead, here we can use the Fill hole option.
• For all the red cons or creation of the surface is followed by the above sequence.

• Fill Hole option is used for this red con.

• With a surface view.

• Here, I have deleted the above surface 1 and merged both the 1 and 2 holes by fill hole option for the better creation of the surface.

• After creating the surface.

• TOPO->FACES->NEW->COONS->SELECT THE SURFACE->GIVE OK.

• To close the open surface, we can use both options. Here Fill Hole option is used.

• Closed view.

• For these complex red cons we should always create a surface by 2 times.

• Selected half circle in the upper and lower surfaces and used the New option to create the surface.

• Remaining half is done through the same method or we can also use the Fill Hole option.

• Final View.

• After clearing all the red cons, We have to find the other errors by using the Check Manager tool.
• Inside the valve some intersection errors are shown.
• So, delete the other surfaces of the valve and lock the remaining to do they intersect.
• Go to the PIDs tool and create the surface names(Also, we can change the color by editing).

• To apply the name for their respective region select the Not option and the PID Region.

• Select the spring and middle click to hide.

• Select column and apply.

• The same way is followed for the spring.

• Now naming is done. After this, If we choose by the name it will hide the other parts.

• Go to TOPO->FACES->INTERSECT->and select the 1st surface as COLUMN and the 2nd surface as SPRING->MIDDLE CLICK.

• Delete the unwanted or extra surfaces and keep the other surfaces.

• After that go to check manager and execute.
• Finally intersection errors are removed.
• Now check the warnings and if it is removable go forward.

• Delete the extra unwanted surface.

• Now the warning section shows only 5.

• Click the ALL tool and check the errors globally.
• The errors are 0.

• Make sure, before meshing all the in and out flows should be closed.
• Here we have to close the hole by surface.

• Final model.

• Start the meshing part. Go to CLASSIC->MESH.
• Give target lenth one by one and element type as 'TRIA' and mesh the model.

TARGET 1 :

• Go to MESH->PERIMETERS->LENGTH.
• Give 1st target length=1 for both perimeters and macros.

• Select the mesh tool and set TRIA as an element type.

• In mesh generation click CFD Mesh->Visible.
• Output of 1mm target length meshing.

• While checking the mesh for the spring alone it is very fine clear and curvy.

TARGET 2:

• Give 2nd target length=3 for both perimeters and macros.
• Target length 3mm mesh model.
• Here the mesh in the spring is not that fine and curvy compared with 1mm mesh.

TARGET 3:

• Always erase the previous mesh model.
• Set final target length=5 and give ok.

• Select CFD Mesh and click visible.

• In this 5mm mesh, the spring is completely not fine and curvy compared with 1mm and 3mm mesh.

RESULT:

• The best mesh in all the 3 cases is a target length of 1mm.
• The reason behind the answer is based on the spring mesh.
• If we closely see the triangles present in the 3 cases spring and the whole model, the target length of 1mm is giving the curviest spring.
• From this we can conclude the best result as a 1mm target length.