Modeling humidity

The flow solver models humidity with a general scalar equation. It traces the movement of water vapor through the fluid domain, updating the density (ρ), specific heat at constant pressure (Cp), thermal conductivity (k), and dynamic viscosity (μ) at each iteration.

You can define humidity by specifying relative or specific humidity values for air:

• Entering the fluid domain.

• As an initial condition on the fluid domain.

When you use the parallel flow solver, you can specify relative or specific humidity values entering the fluid domain as a function of time.

You can model humidity in four ways:

• Define an initial value for the humidity of all 3D air elements by specifying the value on the Initial Conditions page of the Solution dialog box.

• Define an initial humidity value for any part of the fluid domain by creating an Initial Conditions simulation object.

• Define a default humidity value for air entering the fluid domain on the Ambient Conditions page in the Solution dialog box. This is the default humidity value for air entering the fluid domain through the Flow Boundary Condition simulation object.

• Specify the humidity entering the fluid domain at a particular location by defining a humidity value in the External Conditions modeling object, then assign the modeling object to an Inlet or Opening type of the Flow Boundary Condition simulation object. These local settings override the default setting for ambient conditions.

Post process humidity values as relative humidity or specific humidity results sets.

For more information, see 3D flow output requests.

How do I

Define humidity

Model condensation and evaporation

Define humidity

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Condensation and evaporation

Meshing for flow surfaces

Initial Conditions

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Modeling humidity, Simcenter 3D 2021.1 Series

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