Week 2 Challenge : Surface meshing on a Pressure valve

AIM

To mesh the given ansa model with a target length of 1mm ,3 mm and 5mm respectively.

OBJECTIVES

• Learn different model cleaning techniques
• Checks for geometrical error
• To regenerate mssing elements on a model using existing surface, COONS, Fitted and using fill holes
• Geometry cleaning
• PID

PROCEDURE

• Import the given geometry into ANSA preprocessor
• In the cheks tab at the top - Select Geometry - Make sure the given model is in visibilie mode - Select the required checks - Click execute to run the check
• All the errors appear (single cons, triple cons etc.)
• Under the Faces Tab - New - In the dialogue box - Select the required option for model regeneration - select the COONS - Click the mouse middle button
• Use the different options under New Face (existing surface, COONS and Fitted) also using fill hole complete the geometry
• To clean the regenerated geometry delete the nearby lines and newly generated model to remove unwanted small geometries which may cause an error in meshing
• Near the wireframe selection at the bottom in the drop down icon ensure PID selection - Select Properties tab in the top - Right click - Select NEW - Give a name - OK
• A new PID will be created
• Select the PID - Right click - Apply - Select the required model for the PID - Middle mouse button
• Re-Check using the Check Geometry for more errors
• Delete common sections and use undelete option if necessary and remove the unwanted geometries
• After cleaning under the mesh section - Select the perimeter and macros length
• In the mesh parameters tab select the required target lenth, max and min min length, and choose element type as tria
• In the quality section set the min and max length
• Using spot mesh tab mesh the whole model one by one
• Change the mesh target length to 1mm , 3mm and 5mm

OBSERVATION

• WWhile deleting unwanted PID common entities may also get deleted (use undelete to regenerate the deleted sections)
• With higher mesh length the model gets deformed and with a mesh lenth of 5mm some regions of the spring becomes planar
• The mesh length selected should be less than the minimum dimention of the entities

RESULTS

• The meshing of the given model is complete