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15 views

Directional/axes errors in structured grid?

Do you know any good article/review out there on the problematics of direction/axis preference coming from structured grid (cartesian ones for example) and depending on the interpolation scheme?
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0answers
34 views

Tetrahedron Mesh file format

Ply file formats is used to represent mesh structures.I was referring to the example meshes all of which represent ...
0
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1answer
38 views

What is Mesh Independence Report?

I am performing analysis on chassis (Static Structural) and for optimization purpose i am asked to generate MESH-INDEPENDENCE REPORT,of which i have no idea. I have tried going through research papers ...
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0answers
25 views

Conceptual question about fitting of scattered data

What are the problems that arise when fitting (2D or 3D) a set of scattered data? (non uniformly distributed) I had some data I had to fit and I solved the problem using the triscatteredinterp() ...
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0answers
23 views

Data format for Cartesian mesh with cut cells

Is there a mesh data format which is particularly well suited for Cartesian meshes with Dey-Mittra style cut-cells? Ideally, one which does not require converting the cut-cells into a more general ...
4
votes
3answers
167 views

Need a simple mesh format (for FEA) and a tool to generate the mesh

I want to write a 2D FEA code for my course project and I need to import a mesh (2d, simple quad/tri) on a simple geometry such as a L shaped plate or with a square/circular hole in it, something like ...
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1answer
59 views

CFD: Mesh problem [closed]

I wish to study the 2D heat transfer of the soda can using Fluent. For my geometry I took a circle. My problem while meshing the circle; Because i need to mesh it from inside. I used the mapped faced ...
3
votes
2answers
223 views

Programming Finite Element Methods in C++

I am trying to develop a library for finite element methods in C++ and for that I am looking at the data structures for meshes. Based on what I've read up on fenics and deal.ii, the general ...
4
votes
1answer
76 views

Where to find CAD and mesh models for tests?

I often find in the literature some numerical tests use CAD and mesh models. I also want to reproduce their results or test my algorithms on those models. But I am not trained to use CAD or mesh ...
2
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0answers
41 views

Produce one smooth curve on one triangle mesh

I hope to get one smooth curve on one triangle mesh. I get one path on the mesh at first. The path consists of vertices of the mesh. I can see the path from the image below. Each one green dot ...
0
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1answer
69 views

Windows C++ library for operations on mesh with a mex-interface in Matlab?

Please recommend me a well documented C++ library that I could wrap with a mex-interface in Matlab. The library should have the capability to read meshes (optimal in different formats, at least in ...
1
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0answers
40 views

Algorithm for merging mesh with cad file

I am writing the pre processing program for a porosity based cfd project we just started. Basically I have a 3 dimensional mesh made of cubes and I need to import a STL file over it, and calculate how ...
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0answers
33 views

Algorithm for porosity based CFD mesh

I am writing the pre-processing program for a porosity based CFD project. I have a mesh made of cubes, and need to import an object (a stl file: triangular mesh, not solid) over it. The cubes will ...
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0answers
21 views

Finding a parametrized surface with normal constraints on the boundary

I have a disk-like domain $D$ in $\bf{R}^2$ (let's assume the unit disk) and would like to find a parametric surface $f: D \rightarrow \bf{R}^3$ that satisfies the following constraints on the ...
1
vote
1answer
175 views

Moving airfoil boundary conditions

I am trying to simulate a moving airfoil with constant speed (Mach=0.755, aoa=1.25). I solve Euler equations with Roe's method. I have two boundary conditions: Farfield Slip wall (airfoil) For all ...
1
vote
0answers
82 views

data structures for efficient/easy implementation of finite volume method for 2D Poisson equation

My question is about implementation alone. Consider a square domain with regular square, cell centred finite volumes. This is for the multiscale finite volume method (Jenny and Lunati) I need to ...
3
votes
1answer
191 views

Meshes in codes that do AMR

In light of this question and some stuff I read online I am wondering if large FE libs (e.g., deal.ii, libmesh etc.) that do AMR keep the entire mesh or possibly a coarse version of the entire mesh on ...
1
vote
1answer
604 views

Modelling rotating machinery other than AMI rotating meshes

I have case of a rotating fan at Low- speed ie about 300-400 rpm. I have successfully carried out RAS simulations using cyclicAMI approach where, the motion of the fan is modeled as rigid body ...
5
votes
1answer
203 views

Why dual graph for mesh partitioning

Software such as ParMetis or PTScotch partition a graph. When one wants to use it for mesh partitioning (for example for FEM), a dual graph whose vertices represent cells of the original mesh is ...
3
votes
1answer
113 views

What is the most efficient way to represent a 1D function using $hp$-finite element basis functions

Given a one-dimensional function (let's say infinitely differentiable) and a prescribed accuracy of an L2 (or H1) norm, what is the optimal mesh and (in general arbitrary) polynomial orders on each ...
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2answers
202 views

mesh spatial dimension in OpenFOAM

My default mesh geometry length is in 80 mm. For OpenFoam, I scaled the mesh in meters as 0.008 m. Once I import the mesh in OpenFOAM, it is a collection of point coordinates. Now, the location of ...
0
votes
1answer
694 views

Convert STL file to other formats like .msh (Gmsh) and .inp (Abaqus)

After reading some stuff on STL files, I realized that they do no contain information about a mesh (connectivity for instance) , but they represent the surface geometry of the part to be meshed. ...
3
votes
2answers
534 views

Survey on automatic structured mesh generation tools

I would like to gain knowledge on available free or commercial tools to generate automatically structured mesh from geometry, particularly quadrilateral. Which options do I have ?
1
vote
1answer
240 views

Gmsh - dividing a plane surface

How to divide a surface to subdomains, which can be recognized in msh file? Avoiding duplicated nodes is necessary. In general I have geo file which contains definition of smaller and bigger region, ...
3
votes
1answer
84 views

number of tetrahedra in unstructured mesh when edge length is halved

For a given 3D domain, two unstructured tetrahedral meshes M_1 and M_2 are generated. The average edge length in M_1 is double the average edge length of M_2. Are there estimates on the ratio of the ...
7
votes
3answers
377 views

Best Methodologies for Managing a Mesh in Parallel Finite Element Computation?

I am currently developing a domain decomposition method for the solution of the scattering problem. Basically I am solving a system of Helmholtz BVPs iteratively. I discretize the equations using ...
4
votes
2answers
780 views

FEniCS: importing mesh along with material and boundary data

Which is the preferred way to import into a FEniCS (python) program a mesh which was generated in an external generator which provides sub-domain and boundary markers? I was using ...
2
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2answers
427 views

Octave 3D mesh, data from file

I have a big file with 3 columns: density, dimension, value. example: 10 0.3 200 10 0.4 300 20 0.3 250 20 0.4 320 ... I am trying to draw a 3d plot - ...
7
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2answers
908 views

Mesh Independence Study: Is the Independent Mesh Really the Best One?

I am running a mesh independence study. I start with Mesh 1 and proceed up to Mesh 4, each time doubling the number cells in the mesh. In parallel, I am comparing my computational results to ...
1
vote
2answers
167 views

How to define a cylinder surrounded by a clustered cartesian mesh

I am trying to model a flow past a cylinder using the projection method. I am a bit confused on how to define the circular cylinder in my computational domain. I know that the cylinder has the ...
3
votes
1answer
323 views

How to do local FFT on huge 3D vector data cell mesh and visualize it spatially?

Simulation type: I'm running a simulation with the OOMMF micromagnetics package http://math.nist.gov/oommf/ where are magnet is represented by a mesh of 3 million cells, it gets excited by a ...
4
votes
1answer
118 views

What is the most efficient approach to interpolate values between two FEM meshes in 2D?

I am looking for efficient algorithm to interpolate values from one unstructured 2D mesh grid to another. Both grids are constructed using the same type of elements (triangles or quadrilaterals). Both ...
5
votes
1answer
512 views

Flexible Mesh Framework

I am looking for flexible and easy to learn mesh framework which provides data structure for representing and manipulating meshes in 2D i 3D. I've already found a few: MSTK ...
2
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0answers
118 views

Mesh partitioner that assures non empty subdomain?

Does some of you know a mesh partitioner that assures non empty subdomains? For METIS, ParMETIS and Zoltan this is not the case.
4
votes
1answer
123 views

Properties of a Shockwave in Fluid Calculations

The comments on the accepted answer of my previous question here have left me with a more general question about accurately capturing shockwaves in fluid calculations. For the sake of having an ...
5
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2answers
269 views

Efficiency of a Dynamic Mesh vs. a Static Mesh for a Propagating Shockwave

I have a low speed flow with a high voltage discharge occurring within it between two spherical electrodes. We have quite a bit of data from the experiment and have performed 0-D modeling of the ...
3
votes
1answer
258 views

Quality open source AMR libraries [duplicate]

Possible Duplicate: Is there a general-purpose library for structured grid adaptive mesh refinement? I'm looking for a quality, open source, maintained, scalable automated mesh refinement ...