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Porous baffles for ventilation purposes

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Old   October 24, 2016, 12:03
Default Porous baffles for ventilation purposes
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Fábio
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Hello,

I am performing a ventilation simulation in Flow-3D v.11, where I need to include manufactured ventilation inlet diffusers. I first performed the simulation in a micro-scale, where I included the actual model of the diffuser (view Figure 1) and was successful.

However, on the macro-scale of an entire building, these diffusers are of small geometry, with very small holes, which is impossible to define due to the amount of cells needed.

It has been suggested to me to try to approximate these diffusers using porous baffles. Does anyone have any experience on this, or of any other method that may solve my problem?

Thanks!
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Old   October 25, 2016, 08:15
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Quote:
Originally Posted by FUDM View Post
Hello,

I am performing a ventilation simulation in Flow-3D v.11, where I need to include manufactured ventilation inlet diffusers. I first performed the simulation in a micro-scale, where I included the actual model of the diffuser (view Figure 1) and was successful.

However, on the macro-scale of an entire building, these diffusers are of small geometry, with very small holes, which is impossible to define due to the amount of cells needed.

It has been suggested to me to try to approximate these diffusers using porous baffles. Does anyone have any experience on this, or of any other method that may solve my problem?

Thanks!

Hey there
you can use porous substances
and define the number
in depend how much is porosity and u should calculate it
for soils and some substances these numbers are available in books and internet but for this specific geometry u should calculate it
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Old   October 25, 2016, 09:29
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Hi,

Thanks for the reply!

I calculated the porosity and introduced the value. Then, Flow-3D also requires a loss coefficient with means of velocity (linear or quatratic), which I made an approximate calculation of. This worked very well on a micro-scale, that is, only simulating the airflow a few centimeters around the specified diffuser. On a macro-scale, that is, simulating the entire ventilation system of a two story house with several inlet diffusers, I am still studying the best mesh definition.

Anyway, do you know if there are other options to solve this problem (e.g. conforming mesh), and if there are any published studies on this matter using Flow-3D?

Thanks for the help!
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