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FLUENT DISCRETE PHASE MODULE

Delaunay Arnaud (mfn05) and Eric Valette (mfn12)

Introduction

Physical problem

Using discrete phase with FLUENT

Results

Conclusion

1 - Introduction

The first task was the study of free surface flow with Fluent 4. The module wasn't present in this version. So,we changed our task to study discrete phase modeling with Fluent.

In addition to solving transport equation for the continous phase, Fluent simulate a discrete second phase in a Lagrangian frame of reference. This second phase consist of spherical particules dispersed in the continous phase.

2 - Physical problem

Our aim for this task is to study the sedimentation of sand in a sedimental station.

First we defined a grid made by prebfc which is like :

We tried to respect the original size of the sedimention station. We can see at the lower left corner the inlet, which is an 50 centimeter width inlet. The outlet is on the right top corner.

The total length of the station is 20 meters. The height is 5 meters.

After making the grid, we used Fluent to calculate the velocity field in the station.

For the inlet, the boundary condition is a velocity of one meter per second. The outlet is a pressure bondary condition if 0 Pa.

We used the K-e model to calculate the velocity field in the station. We can see below the results of this simulation :

With this result we started our research to introduce a discrete phase.

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3 - Using discrete phase with FLUENT

We have made a manual to use this part of Fluent. We tested several cases of applications and differents options of Fluent.

4 - Results

You can see here differents results of Fluent with sand :

We see the trajectories of 10 particules colored by The initial position

This case occured with small particules : Diameters : 1e-4 m

This case occured with heavier particules of sand : D=3e-4m

In the case belowthe particules are all injected at the same point but have not the same diameter. They are colored by the diameter.

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5 - Conclusion

We haven't done the inital task because the used module for free surface flow study isn't present in Fluent 4. we have studied discrete phase with this version. We didn't understand all the specificities of Fluent, for example the stocastic model in the "define discret phase model" . Nethertheless, we have understood the global aim of this module.

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