How to Use the Solar Load Model in FLUENT for Focused Radiation on Internal Surfaces?

To achieve the effect shown in the image, where solar radiation is focused on an internal surface inside a domain using ANSYS Fluent's Solar Load Model, follow these steps:

1. Understanding the Solar Load Model in Fluent

The Solar Load Model allows you to simulate solar radiation in CFD. It considers the sun's position, beam direction, and attenuation by materials (e.g., semi-transparent boundaries) to predict radiation effects in the domain.

Key components:

Solar Radiation Beam: Direction and intensity of the sunlight.
Semi-Transparent Boundary: Allows partial transmission of solar radiation.
Internal Absorption/Focus: Defining surfaces or volumes to receive radiation energy.

2. Steps to Implement Solar Load and Focus Radiation

A. Enable the Solar Load Model

Open ANSYS Fluent and load your mesh.

Go to Models > Radiation > Solar Load Model and enable it.

Choose: Solar Irradiation: Input the solar intensity. Solar Direction: Define the beam direction using solar angle parameters.

B. Define the Semi-Transparent Boundary

Select the top boundary surface as semi-transparent: Go to Boundary Conditions > Select the top surface. Set the Material Type to Semi-Transparent. Define Solar Transmissivity (e.g., 0.8 for 80% transmission).

This setting allows part of the radiation to pass through the top boundary while still diffusing some energy.

C. Create a Focused Radiation Effect

Geometry Consideration: If your domain includes a focusing element (e.g., parabolic shape):Import your geometry into Fluent that mimics the focusing optics. Ensure the top semi-transparent boundary transmits radiation into the cavity.

Adjust the Solar Beam Direction: Modify the Solar Beam Angles to align with the focusing geometry so that the radiation converges onto the desired internal surface. Beam direction can be specified via: Solar Direction Vectors. Latitude/Longitude and Time of Day (if the sun position model is used).

Surface Interaction: Define the internal surface to absorb radiation: Set Wall Boundary Condition. Enable Radiation with proper thermal boundary settings. Use a high Absorption Coefficient for the internal surface.

D. Post-Processing

After solving: Use Contours to visualize Solar Irradiation (G) and Surface Temperature (Tp). Check the solar flux distribution to ensure radiation is focused on the internal surface.

Enable Volume Rendering if you need to visualize solar energy passing through semi-transparent materials.

3. Key Tips

Use an appropriate Material Model for the semi-transparent boundary (e.g., glass or a custom defined transmissive material).
If required, you can incorporate Monte Carlo Radiation Model for more accurate energy transfer simulations.
Use High-Resolution Mesh in regions of focused radiation to resolve temperature gradients.

By aligning the solar beam direction and using the appropriate semi-transparent material properties, you can simulate a radiation-focused effect like the one in your image. Let me know if you'd like further assistance with specific Fluent settings!

Zainab Abdul Karim Alkhekany

How to Use the Solar Load Model in FLUENT for Focused Radiation on Internal Surfaces:

Enable the Solar Load Model:Activate the Solar Load Model from the model setup menu. Specify the solar intensity and direction.

Define Internal Surfaces:Ensure the target internal surfaces are properly defined as boundary types (e.g., walls).

Set Up Focused Radiation Effects:Use Solar Ray Tracing to simulate radiation through lenses or apertures. Assign absorptivity properties to the internal surfaces.

Configure Solar Load Settings:Input the solar position (latitude, longitude, and time). Enable diffuse radiation or shading effects if applicable.

Run the Simulation:Use a refined mesh in regions where focused radiation occurs. Select appropriate radiation models (e.g., DO or S2S).

Analyze Results:Visualize heat flux or temperature distributions on internal surfaces. Use solar load reports to evaluate absorbed, reflected, or transmitted energy.

Tips:

Use transient simulations to account for changing solar angles over time.
Enable specular reflections if the surfaces are highly reflective.

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