Introduction (porous media flow and catalytic converter simulation)
Modeling of porous media flow has many applications in industries such as filters and catalyst bed. In this tutorial, you will learn how to model and solve a problem involving a gas flow in porous media. For this purpose, we simulate a catalytic converter including gas flow. Usually, we use catalytic converters in diesel and gasoline engines purifying the exhaust gasses. In this method, dangerous emissions that are harmful to the environment are converted to acceptable materials. These emissions include carbon monoxide, nitrogen-oxides, and unburned hydrocarbon fuels. Exhaust gas must pass through a layer. The layer has a ceramic structure which is covered by a catalyst such as platinum or palladium.
Steps in the simulation of porous media flow and catalytic converter
CFD analysis for design of a catalytic converter is very important because we need to understand the pressure gradient and velocity distribution throughout the layer. The gas flow modeling helps us model non-uniformity in the layer. In this tutorial, we use ANSYS CFX to simulate the geometry of the catalytic converter in a flow of nitrogen gas. The nitrogen at the input of moves through a channel at 10m/s uniform velocity which then goes through a square shape channel (ceramic monolith substrate) and finally it exists at output. Bed along y, z is impermeable, to determine this, we consider the coefficients of loss in these directions three times greater than the x direction.
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