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## Simulation Moldflow Insight

Active Contributor
Posts: 34
Registered: ‎02-17-2011

# Why tria/tetra element types ONLY used in moldflow analysis?

954 Views, 9 Replies
04-07-2011 01:11 AM

Hello,

I have a basic moldflow analysis query.

While performing moldflow analysis we use triangular / tetrahedral type mesh for analysis. Why these element types only used and why don't we use other element types?

Regards,

Mathankumar.R

Distinguished Contributor
Posts: 182
Registered: ‎03-18-2009

# Re: Why tria/tetra element types ONLY used in moldflow analysis?

04-10-2011 09:33 PM in reply to: rmathan

solver algorithems are  developed for these type of mesh to do calucalations in moldflow

so we need to use these types only.

Active Contributor
Posts: 34
Registered: ‎02-17-2011

# Re: Why tria/tetra element types ONLY used in moldflow analysis?

Do you know the basic behind why the solver Algorithams have been developed for these tria/tetra mesh types?.

Regards,

Mathankumar.R

Active Contributor
Posts: 48
Registered: ‎10-24-2010

# Re: Why tria/tetra element types ONLY used in moldflow analysis?

04-15-2011 10:20 PM in reply to: rmathan

Because tria and tetra only can give most diminished close loop than other elements (!)

Active Contributor
Posts: 34
Registered: ‎02-17-2011

# Re: Why tria/tetra element types ONLY used in moldflow analysis?

04-18-2011 10:59 PM in reply to: lahkar

Do you know the mathematical calculations or theory behind the tria/tetra mesh used in moldflow analysis?

Regards,

Mathankumar.R

Employee
Posts: 11
Registered: ‎08-23-2009

# Re: Why tria/tetra element types ONLY used in moldflow analysis?

05-01-2011 07:08 PM in reply to: rmathan

Hi,

Are you really sure you want to know the Theory behind? There are excellent books on the subject.

As an example, "The Finite Element Method" by Zienkiewicz and Taylor.

Personally, I will say that when it comes to meshing, the best type of element to cover all shapes are tetrahedron in 3D. In addition, they are less inclined to locking phenomena compared to wedges and hexahedron and you can always extract tetrahedron from wedges and hexahedron and not the other way around.

Cheers,

WARNING: The above comments are based on personal opinion and should be considered as such with no garantee attached.

Active Member
Posts: 6
Registered: ‎01-10-2013

# Re: Why tria/tetra element types ONLY used in moldflow analysis?

01-10-2013 08:32 AM in reply to: rmathan

are you asking because u have seen sigmasoft and Moldex are using Hexa mesh?

there are very nice books avaible to read the maths behind flow analysis and why moldflow used tetra as 3D mesh

Distinguished Contributor
Posts: 182
Registered: ‎03-18-2009

# Re: Why tria/tetra element types ONLY used in moldflow analysis?

01-11-2013 11:22 AM in reply to: rmathan

can you please name those book/ authour name???
New Member
Posts: 2
Registered: ‎01-14-2013

# Re: Why tria/tetra element types ONLY used in moldflow analysis?

Flow analysis of injection molds:Peter Kennedy

Injection Molding: Integration of Theory and Modeling Methods By Rong Zheng
Active Contributor
Posts: 34
Registered: ‎02-17-2011

# Re: Why tria/tetra element types ONLY used in moldflow analysis?

01-28-2013 01:44 AM in reply to: sdpimple

Thanks!

Regards,

Mathankumar. R