ANSA - Surface meshing on a Pressure valve

Problem Statement: -

For the given model, check for the geometrical errors and perform Topology cleanup accordingly. Set three different target lengths as three different cases and mesh the model.

• Target length = 1mm, 3 mm and 5 mm (i.e. 3 cases)
• Element type = Tria
• Apply any one target length from the above at a time for the entire model as One case. Submit 3 different models for 3 cases.

Solution: -

AIM: -

A. For the given Flow Valve Model perform Geometrical errors and perform Topology cleanup.

B. Perform Surface Meshing with Triangular mesh structure and target lengths of 1mm, 3mm, and 5mm.

Given: -

A. A CAD Flow Valve Model in ANSA is shown below: -

     i. Solid View: -

     ii. WireFrame View: -

Process of Generating Mesh: -

A. Filling All the Holes of the Model: -

     i. Description of Tools used(Reference - ANSA Help): -

        a. Fill Hole(Cons) `->` This function fills holes on Faces. The holes can be of any shape. Such internal openings can be selected individually, or automatically among the visible ones if they fall below a user-specified diameter value. There is the option to create automatically 3D Curves, Points, or Connection Points of the removed holes, in order to mark their shape and position for reference.

        b. New(Faces) `->` This function defines a new surface by selecting its boundary curves and creates a corresponding face that covers the new surface. The calculated surface appears as a net.

     ii. Step OUTPUT: -

B. Performing Uniform Orientation: -

     i. Description of Tools used(Reference - ANSA Help): -

        a. Orient(Macros) `->` This function sets a uniform orientation direction to all visible Faces according to the orientation of the majority of the Faces. The mesh elements that will be generated, or those already existing, also obtain a uniform orientation.

     ii. Step OUTPUT: -

C. Performing Surface Cleanup: -

     i. Description of Tools used(Reference - ANSA Help): -

        a. Fill Hole(Cons) `->` This function fills holes on Faces. The holes can be of any shape. Such internal openings can be selected individually, or automatically among the visible ones if they fall below a user-specified diameter value. There is the option to create automatically 3D Curves, Points, or Connection Points of the removed holes, in order to mark their shape and position for reference.

        b. Join(Macros) `->` This function eliminates a Macro Area boundary segment between two adjacent Macro Areas. This way, two Macro Areas are joined to be treated as one, larger Macro Area.

        c. Delete(Hot Point) `->` This function deletes selected Hot Points that are not crucial or necessary in any way.

     ii. Step OUTPUT: -

D. Giving Property Names/PID Names: -

     i. Description of Tools used(Reference - ANSA Help): -

        a. Properties/PID `->` This function facilitates property management. A list of the properties existing in the file is available. Management windows, such as this one, provide filtering, sorting, and selection capabilities on the listed entities as well as the definition of new entities.

     ii. Step OUTPUT: -

E. Creating Surface Mesh: -

     i. Description of Tools used(Reference - ANSA Help): -

        a. Mesh Parameters `->` This function opens the 'Mesh Parameters' window, where the user can define the parameters for the Reconstruction, Reshape and Fix functions.

        b. Quality criteria `->` Select and set the respective quality criteria for the corresponding elements to perform the Quality Checks (Hidden Mode). Also, set the general presentation settings concerning the ANSA workspace.

        c. Length(Perimeters) `->` This function defines the element length on selected perimeter segments or macro areas. The element length may be explicitly declared or may be declared as a factor to be multiplied by the existing element length.

        d. CFD(Mesh Generation) `->` This function is recommended after the user has applied the Perimeters>Spacing(Auto CFD) on the selected perimeters. This algorithm meshes with variable element length, depending on the local curvature of the underlying CAD surface, under tight user-controlled specifications. It generated the less possible elements taking into account all small details of the geometry. This algorithm is an advanced meshing algorithm tailor-made to meet CFD specs or other application areas where a variable size mesh is required.

      ii. Step OUTPUT: -

        a. Mesh Generated for a Target Length of 1mm: -

        b. Mesh Generated for a Target Length of 3mm: -

        c. Mesh Generated for a Target Length of 5mm(Here, the Spring Mesh Target Length is 1.5mm): -

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