The tag has no wiki summary.

learn more… | top users | synonyms

0
votes
0answers
17 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
96 views

Moving airfoil boundary condtitions

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
55 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
172 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
285 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 ...
0
votes
0answers
32 views

library for Refine a tetrahedral volume domain over the intersection points of the edges and a level surface

I tried with fenics and tetgen but these libraries has not this functionality. an example is fenics fenics qa the idea is simple given a tetrahedrical domain $\Omega$ and a surface $\psi(x,y,z)=0$ ...
4
votes
1answer
160 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
104 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 ...
0
votes
2answers
127 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
510 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
368 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
164 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
78 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
321 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
609 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
votes
1answer
275 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 - mesh with mesh() function in octave, like this: ...
7
votes
2answers
613 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
154 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 ...
2
votes
0answers
102 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.