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Ubuntu Manpage: blockMesh


Proof-of-Authority is a consensus algorithm often applied to private blockchains that uses assigned 'authorities' to sign blocks. Proof-of-Work in contrast which is mostly applied to public blockchains lets miners solve complex mathematical problems for consensus. For their upcoming ICO, BlockMesh needed a functioning version of the wallet application as soon as possible. Before that, they needed to test the blockchain related functions (send/receive tokens) of the app with community testers.

I wonder if anyone know the possible reasons. Hi I have the current blockMeshDict files (attached), and I want to refine this mesh along the `x` and `y` axis, I have no problem with the z axis.

The vision of BlockMesh is to create the world's first decentralised, cost-free communications network. The incentive layer is given by using an integrated reward system based on Blockchain technology. I am running simulations in OpenFOAM with icoFoam. But after a few time steps, the Courant number increases to a very large value.

The production of the lattice girder is performed by a welding process of the transversal wires onto the longitudinal wire. The blockmesh welding machine is fed by six coils located in pay off devices where four feed the longitudinal wires and the othes two the two transversal wires. The transversal wires, thanks to a complete automatic system, is cut in a precise length and welded in plain with the longitudinal wires, reaching a maximum speed production up to 40 m/min. The blockmesh welding machine is composed by two parallel longitudinal wires and one transversal wire, inserted one by one, and welded, in the same plane of the longitudinal wires.

5.3.3 Projection of vertices, edges and faces

I tried your case and it runs fine. So it isn't an issue related to blockMeshDict (by and large).

BlockMesh description

What is BlockMesh?

BlockMesh description

The velocity profiles are analyzed for different mesh grid variations and the convergence graph is plotted for the below provided design. There’s no description of BlockMesh yet.

Help us make a description by answering 5 simple questions. The line is designed for the production of electric-welded plain lattice girder, starting from coils of cold rolling wire (ribbed).

Project Description

Refinement levels, as @minggangyin pointed out is setting the surface refinement for each BF geometry. Each level halves the previous cell size, which starts as the size of your are of interest (usually 1m with autograding) at level 0. After our internal testing iterations we gave greenlight for the alpha version to be tested by BlockMesh's community. Design specifications were provided by BlockMesh beforehand. For this reason we always set up a private, Proof-of-Authority blockchain for both internal and client testing purposes at the start of every project.

BlockMesh description

◆ geometry()

BlockMesh description

The standard mesh distribution along the x-direction is 200 cells and along y-direction is 10 cells. That’s precisely the count of cells you get during your blockMesh. It’s hard, almost impossible to predict the cells after snappyhex, although you get better at it with experience. I would allow for at least double the blockMesh cells as globalcells, maybe more depends on geometry.

  • The blockmesh welding machine is composed by two parallel longitudinal wires and one transversal wire, inserted one by one, and welded, in the same plane of the longitudinal wires.
  • So it isn't an issue related to blockMeshDict (by and large).
  • The simulation of the backward facing step is carried out using icoFoam solver in OpenFoam open source toolbox.
  • The vision of BlockMesh is to create the world's first decentralised, cost-free communications network.
  • ParaView can be be used to open 'case.foam' and display the resulting mesh.
  • Design specifications were provided by BlockMesh beforehand.
BlockMesh description

If I increment the mesh resolution along the `x` or `y` axis the checkMesh throws errors. so I think that increase the blocks resolution its not the solution, and I want to try using the refineMesh utility, to see what's happen. If you are using a scripting language python to create the blockMesh file, it is more convenient to extend it for the complete geometry.

BlockMesh description

./ToolOpenFoamExample1/system/controlDict

It can be analyzed that as the time is increased, the courant no may break above 1 and lead to divergence. But it can be controlled by dt. Since the time is constant for all the three different mesh, the dt is chosen according to the time from 0 to 0.1. The simulation of the backward facing step is carried out using icoFoam solver in OpenFoam open source toolbox.

BlockMesh description

ParaView can be be used to open 'case.foam' and display the resulting mesh. Click on 'Properties | Apply' on the left, to view the mesh.

To realize their vision, BlockMesh needs an incentive mechanism to reward network participants who provide their smartphone's as access nodes to the network. The reward should be automatically calculated and be paid by other network participants who benefit by having internet access. While the team of BlockMesh is building the hardware our mission is to develop the wallet-application and integrate payment channels for micropayments.

BlockMesh description

From the icoFoam solver, the simulation of the flow is carried out and the below table represents the time step, max courant no obtained for different mesh sizes. The simulation is done using icoFoam flow solver with an initial velocity of 1m/s and for the time varying from 0 to 0.1 sec for three different grading factors (0.2,0.5,0.8) near the wall.

BlockMesh description

blockMesh is a very good tool and produce excellent meshes do not give up using it. The below figure represents the simulation profile obtained after the time of 0.1 sec for all three different meshes. It can be observed that, for the mesh grade of 0.8, the max courant no is at 0.4 for the end time of 0.1 sec.

BlockMesh description

all you need to care about there is globalCells, all the rest you can ignore. As mentioned put a high number, at least 2xblockMesh cells (I would go higher). Remember to be smth your computer can handle (about 1million cells for 1GB of RAM). After calling blockMesh.exe, the files 'boundary', 'faces', 'neighbour', 'owner' and 'points' are created, in the folder 'constants/polyMesh'.

BlockMesh description