Week 2 Challenge : Surface meshing on a Pressure valve

' Surface meshing on a pressure valve

Intoduction:

The objective of the project is to learn surface meshing on a pressure valve by using some methodologies learing from live and video lectures.Actually there is many reason behind need for the meshing and some systematic procedures also contain in this project.In this project is surface meshing on a presuure valve.The pressure valve is nothing but relief valve ,its the device to control or limit the pressure of the system.There is three basic steps are there in analysis of the model.steps follwing by

1. Pre processor
2. Solver
3. Post processor

Pre processor:

Pre processing also called meshing.It is the first step involved in solving a problem in a FEA as well as CFD also.Here the entire domain is discretized or divided into a meanigful divisions often called "Elements".These elements form the building block on which the boundary conditions and external effects are specially given by as as per requirement.In this project we concentrate on pre processing like Meshing of a given model.

Meshing:

CFD meshing applies a numerical grid to a fluid body and boundary,similar to meshing in finite element simulations.Meshing algorithems are used to generate collections of grid points(Nodes),which will determine the accuracy of a CFD simulation.

Basic procedure before meshing:

Before meshing we shoud do some clean ups inorder to get perfect mesh.These are follwed by,

1. Resolution adjustment
2. Close all open surfaces
3. Surface cleaning
4. Assigning PID's
5. Applying meshing qualitys
6. Meshing.

these are the basic of pre processing as well as meshing.now we have to move on about given model.

Aim:

To complete surface meshing on a given pressure valve geometry with triangular meshing type.The given geometry meshed by tria elements with 1 mm,3 mm and 5 mm respectively.There are many pre porocessing softwares are there in the field.we are using ANSA software.

ANSA:

ANSA is a computer aided engineering tool for Finite Element Analysis(FEA) and Computational Fluid Dynamics(CFD) analusis used in the automative as well as in aerospace industries.It is developed by BETA CAE systems.It is the one of the famous software in the market.

Now we moved to the processing included in surface meshing on a given model.

Surface meshing:

The surface mesh is the representation of a surface that consists of vertices,edges, and faces.There are currently two distinct alternatives for the surface reprentations in the deformable meshing literature,namely triangular and simplex meshes.Triangular meshes are composed of triangle faces which share each of their edges with exactly one other triangle face.Simplex meshes are topological duals of triangular meshes.The choice pf the best reprentations depends on the apllication or given model.In this project also we used triangular mesh as per given information.

Given model geometry:

Procedure step by Step process:

• Wire frame mode

Wireframe mode is the one of the best mode to see the inner structure and it is used to check update instantly.Below figure is given model geometry wire frame mode,

• Surface cleaning
  Surface cleanig innocence we have lots of open faces are there in a given geometry.we want to do fluid flow analysis that's why we required to close all holes innorder to removing red,blue cons.
  
  • Removing red cons
    By using surface creating methods like coons,loop,Fill hole and planner.After removing red cons and un wanted hot points the below fig shows that,
    
    Normal mode
    
  • Assigning PID:
    PID is nothing but Property ID.It is the process to give a name for every component of the geometry.There are 7 components are there,below figures are PID names and PID mode.
    
• Geometry checking
  Geometry checking is the one of the best option to know the errors in the geometry.In this geometry have some errors below fig shows that,
  
• Error rectifing:
  In this geometry there are two types of error occuring, that is geometry error and penetration error.
  • Geometry error:
    In this geometry there is 4 warnings are there we have to try clear that warning.but these are triple cons.Actually these triple cons are came because of inlet 2 face.so we decided that it is necessary face.
  • Inersection error:
    Intersection error is the error occuring on the working geometry when two or more components intersect each other surfaces.If it is not cleared we cannot do volume mesh.so t is important error to clear.In given geometry there are two components like spring and colum are intersecting together.Using Intersect option can find and remove the unwanted intersectinal faces.The below Fig shown that finding and rectifing of intersection errors.
    
    After removing intersection
    
    
    after removed intersection warnigs are added in geometry errors.below fig shown warning details
    
    These convex and triple cons are cannaot be clear.Because it have neccesary faces so we cant delete that.
• Applying quality of meshing:
  Applying meshing quality is besed on requirement based on the application.By using quality meshing option we can add quality items.
  • Meshing quality:
    Actually applying Minimum and maximum length of the tria element inorder to incrase the accuracy and increasing the mesh quality.
    
• Diffrent mesh length:
  
  • 1mm length:
    • Min and Max values:
      For 1 mm target length i was applied min amd max lengths are 0.5 mm and 1.5 mm.
      
      
  • 3 mm length:
    • Min and Max lenth:
      For 3 mm target length i was applied min amd max lengths are 2.5 mm and 3.3 mm.
      
      
      
  • 5 mm length:
    • Min and Max length
      For 5 mm target length i was applied min amd max lengths are 4.7 mm and 5.2 mm.
      
      

Solution with measuring:

• 1 mm
  spring and column:
  
  Pressure valve:
  
• 3 mm
  spring and column:
  
  Pressure valve:
  
• 5 mm
  spring and column:
  
  Pressure valve:
  
  

Conclusion:
The given model geometry is successfully surface topo cleaned,applying quality meshing as per given three different target length like 1 mm,3 mm, and 5 mm.After all clean up procedure and after all quality meshing procedure succesfully obtained and showcased in this report.i have enclosed original ANSA file.finaly the given task was successfully completed.