Software to mesh using high order element with unevenly spaced interpolation node

lzhaok6 · July 8, 2016, 23:32

I'm looking for a software that would be able to generate 3D mesh using spectral element method. By saying spectral element, I mean the gird points are not evenly distributed when high order interpolation is used (e.g. Gauss-Lobatto points).

Softwares I know (e.g. Abaqus, gmsh, Patran...) only allow evenly spaced interpolation nodes. Abaqus seems to allow users to generate their own element type and do the meshing manually. But the illustration in user manual is not very specific. Patran could insert offset point into an individual element but not for all element. (element type can not be defined)

Any advice would be appreciated!

psakievich · August 13, 2016, 18:20

Typically the Gauss-Lobatto points are incorporated on the internals of the element since they are used as the basis/shape functions. A standard mesh should do and then the internals of each element will have the GL points based on the level of p refinements you are using.

lzhaok6 · August 13, 2016, 23:01

Quote:

Originally Posted by psakievich

Typically the Gauss-Lobatto points are incorporated on the internals of the element since they are used as the basis/shape functions. A standard mesh should do and then the internals of each element will have the GL points based on the level of p refinements you are using.

Thank you psakievich! That was very helpful.

psakievich · August 13, 2016, 23:22

My pleasure. Also if you plan to use higher order elements remember they don't need to be as small as your standard FV mesh. The elements can be larger since you are getting more points inside of them and they are higher order. If you mesh with the standard for low order methods the size of the model in memory will blow up quickly.

lzhaok6 · August 14, 2016, 00:01

Quote:

Originally Posted by psakievich

My pleasure. Also if you plan to use higher order elements remember they don't need to be as small as your standard FV mesh. The elements can be larger since you are getting more points inside of them and they are higher order. If you mesh with the standard for low order methods the size of the model in memory will blow up quickly.

Got it. Thanks again for reminding me that!

July 8, 2016, 23:32	Software to mesh using high order element with unevenly spaced interpolation node	#1
lzhaok6 New Member Join Date: Jul 2016 Posts: 28 Rep Power: 9	I'm looking for a software that would be able to generate 3D mesh using spectral element method. By saying spectral element, I mean the gird points are not evenly distributed when high order interpolation is used (e.g. Gauss-Lobatto points). Softwares I know (e.g. Abaqus, gmsh, Patran...) only allow evenly spaced interpolation nodes. Abaqus seems to allow users to generate their own element type and do the meshing manually. But the illustration in user manual is not very specific. Patran could insert offset point into an individual element but not for all element. (element type can not be defined) Any advice would be appreciated!

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August 13, 2016, 18:20		#2
psakievich New Member Phil Sakievich Join Date: Mar 2016 Posts: 3 Rep Power: 10	Typically the Gauss-Lobatto points are incorporated on the internals of the element since they are used as the basis/shape functions. A standard mesh should do and then the internals of each element will have the GL points based on the level of p refinements you are using.

August 13, 2016, 23:22		#4
psakievich New Member Phil Sakievich Join Date: Mar 2016 Posts: 3 Rep Power: 10	My pleasure. Also if you plan to use higher order elements remember they don't need to be as small as your standard FV mesh. The elements can be larger since you are getting more points inside of them and they are higher order. If you mesh with the standard for low order methods the size of the model in memory will blow up quickly.