Meshing the Valve using ANSA
Objective
To clean up the valve of any error or missing components that may infterfere in the meshing process. And to mesh the valve using three different element sizes, i. e. 15 units, 7 units, and 2 units. In this project we will also interpret the most suitable mesh size for the given valve and the reason behind it.
1.0 Problem
The valve shown in figure 1.1 is the original component which is to be cleaned and meshed. Various different errors or missing/ incomplete geometry can be seen in the image enclosed with red coloured boundary, which is the default way of ANSA to intimate of the possible errors. Figure 1.2 shows the wireframe mode which can be seen by pressing the ctr and the shift key simultaneously. The wireframe mode of the valve shows all the different erros within the geometry in red. In figure 1.3 the inner assembly of the valve can be seen, which are shown as two different components due to some discrepant and overlapping contraints. These overlapping compnents needs to be deleted in order to make spring the same entity of the inner assembly. All of these problems are to be taken care of and the geometry needs to be meshed as required.
Figure 1.1
Figure 1.2
Figure 1.3
2.0 Result
The image in figure 2.1 shows the cleaned geomtery which has been acheived and the meshing will be done on this final assembly. The different element size will be applied using the same method which was seen in the previous project \'Introduction to Meshing using ANSA\' which can be found the following link:
https://projects.skill-lync.com/projects/Introduction-to-meshing-using-ANSA-45021.
The result of the element size 15 can be seen in figure 2.2. This element size distorts the original shape of the geometry to a large extent. This can not be the ideal element size for this geometry. The geometry with mesh size 7 is shown in figure 2.3, the distortion to a smaller extent is still present using this element size, which is somnething not desired while solving a CFD problem. The most appropriate element size out of the three sizes would be element size of 2, which is shown in figure 2.4. This mesh size shows a perfect shape of the geometry which matches with the original shape of the valve. This would be the most ideal mesh size to perform CFD analysis onto this geometry.
Figure 2.1
Figure 2.2
Figure 2.3
Figure 2.4
Conclusion
The geometry was cleaned of any errors or discrepancies. The geometry was meshed using three different element sizes. Meshing with element size of 15 and 7 shows distortion of the original shape and would not cover up enough small pockets of area for whatever calculation may be performed, something that is highly desirable and is the main objective to mesh any part- to acheive small enough grid size that leads to more accurate answers and lesser errors. So to conclude, the best element size to choose for this valve geometry is 2 units seen in figure 2.4.