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some minor correction for homogenization silo simulation

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tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/README.md
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# Simulating a simple homogenization silo using periodic boundary
# Simulating a Simple Homogenization Silo Using Periodic Boundary
## Problem
A homogenization silo is used to mix particles inside a silo using the circulation of particles. A pneumatic conveying system is used to carry particles at the exit and re-enter them from the top. Here, we use a `periodic` boundary to simulate the action of the pneumatic conveyor system for circulating particles. Particles that are exiting from the bottom are re-entered from top using this boundary (`periodic`).
A homogenization silo is used to mix particles inside a silo using the circulation of particles. A pneumatic conveying system carries particles from the exit and re-enters them from the top. Here, we use a `periodic` boundary to simulate the action of the pneumatic conveyor system for circulating particles. Particles exiting from the bottom are re-entered from the top using this boundary (`periodic`).
The simulation case setup is essentially similar to the [`layeredSiloFilling`](https://github.com/PhasicFlow/phasicFlow/tree/main/tutorials/sphereGranFlow/layeredSiloFilling) tutorial. There is also another change with regard to `layeredSiloFilling`. The exit gate is opened after the filling phase of the silo (see `settings/geometryDict` for more details).
<div align ="center">
<b>
A view of homogenization silo
</b>
<img src="./homoSilo.jpeg" style="width: 400px;">
<b>
A view of the homogenization silo
</b>
</div>
***