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How can we effciently mesh for these type of geometries? |
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#1 |
Senior Member
Arun raj.S
Join Date: Jul 2011
Posts: 194
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Hi all,
I have attached a picture of a screen geometry with this ..I want to know whats the efficient way for meshing this?...Also I want to know which type of meshing (Structured grid or Unstructured grid) I need to use .. |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
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The type of mesh which is approriate also depends on the type of model you plan to do. If this is a 1mm wide liquid stirrer you would mesh it entirely differently to a 1km across wind turbine.
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#3 |
Senior Member
Arun raj.S
Join Date: Jul 2011
Posts: 194
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Hi I have attached the Image of geometry which I want to analyze....Have a look at it ..It is the distrtion screen which they will keep in-front of axial compressor to produce distortion
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
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You still have not answered the critical question - how big is the object, or what Re number does it run at?
Also, why are you modelling this rather than imposing its effect as a momentum sink term? |
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#5 |
Senior Member
Arun raj.S
Join Date: Jul 2011
Posts: 194
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how big is the object? 40 CM OUTER DIA AND 6 CM INNER DIA, 3 CM THICK
what Re number does it run at-- velocity -- 50 m/s reynolds n0:1235500 Also, why are you modelling this rather than imposing its effect as a momentum sink term? I don understand this question.. The main thing why am i simulating is i need to find the exit velocity components of this geometry and have to give that as entry velocity components for full rotor geometry?.. I have created the complete rotor geometry ..but i am struck with this ..I am not able to get result for this geometry..Since we don have enough computational facility we are simulating rotor and this distortion screen separately... |
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#6 |
Senior Member
Arun raj.S
Join Date: Jul 2011
Posts: 194
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I have meshed this geometries in Icem cfd with volume mesh option and then i have imported in cfx...When i run this case solver shows it has isolated volumes because of domain interface not properly designed... I DON KNOW WHAT AM I DOING WRONG...
Inlet boundary condition is Cartesian velocity components u=50 m/s v=0m/s w=om/s Outlet boundary condition is :: static pressure :: 101667 pa inteface as :: GGI inteface REMAINING FACES :: WALL :: FREE SHEAR WALL I HAVE ATTACHED THE GEOMETRY OF THE ROTOR ALSO |
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#7 |
Senior Member
Arun raj.S
Join Date: Jul 2011
Posts: 194
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i HAVE CREATED THIS SCREEN GEOMETRY IN ICEM CFD..i HAVE CREATED IT AS A PART ...i WANT TO KNOW WHETHER I HAVE TO CREATE IT AS A PART OR AN ASSEMBLY TO AVOID THESE KIND OF ISOLATED VOLUME PROBLEMS..yOUR HELP IS MUCH NEEDED HERE..
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#8 | ||
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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Quote:
Quote:
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#9 |
Senior Member
Arun raj.S
Join Date: Jul 2011
Posts: 194
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I don no how to impose its pressure drop as a momentum source term?
Could you explain in detail... Also if I wants to know if we do like that then whether we will get the exit velocity components as a file so that it will be easier for me to give it as an input for complete rotor |
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#10 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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Work out a function for the drag of your body versus velocity. You should be able to do by assuming it is a cylinder and using the well known cylinder drag for this Re range. Then read the documentation about source terms and impose the drag on the flow as a momentum source term.
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