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Modelisation of the Cooling of a Cylinder with Fluent

Deghetto Frederic(mfn04) and Sagarra Jeremie(mfn10)

1 . INTRODUCTION

2 . CONSTRUCTION OF THE GEOMETRY

3 . MESH OF THE CYLINDER

3.1 . PREBFC

3.2 . TGRID

4 . CONCLUSION

1 . INTRODUCTION

Objectives :

In a first time , our objectives were to fully modelise the cooling of a cylinder in order to illustrate a third-year project about the conception of a motor. We had planned to build a geometry of a cylinder and its cooling system, then to mesh it in three dimensions with the software T-grid. Then we would have simulated a flow of water around the cylinder with Fluent.

2 . CONSTRUCTION OF THE GEOMETRY

We aimed to modelise a cylinder and its head with prebfc :

The dimensions of the cylinder are taken on the example of the cylinder of a motorbike : a diameter of 58 mm and a height of 78 mm.

We began to construct the interior cylinder with a simple shape :

We defined in this way a interior and ab exterior cylinder in order to make a thickness n order to modelise the phenomenons of conduction.

Then we constructed the cylinder head around the two smaller cylinders, in order to define the zone of circulation of the fluid. We created two entry at the top of the head an two outlets at the bottom of the head.

Here are some views of the 3-D geometry :

3 . MESH OF THE CYLINDER

3.1 . PREBFC

We had to define a mesh of the surfaces before to import the case on the software tgrid which mesh the interior volums. We chose an unstructured mesh with a distance between the nodes of 0.5 mm. We obtain the following results :

3.2 . T-GRID

When the meshing of the surface is finished, the software tgrid must automatically mesh the interior. But when we tried to import the case it refused to mesh it. We did not find the problem and so we could not import the task on fluent.

4 . CONCLUSION

This task was quite ambitious because we tried to modelise a complex case with an intern flow.

We succed to create a realistic geometry, which is the major part of the work and it is a pity that we had a problem of compatibility at the end of the task since we could not visualise the flow and the thermic exchanges.

However this task allowed us to manipulate prebfc and to learn to build complex geometries.

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