RF Amplifier Thermal Analysis with AEDT Icepak: Part 2
Welcome to part 2 of our video series on setting up an RF amplifier model in AEDT Icepak. In the first part, we defined our geometry, building an RF amplifier box shown in green. This box contains heat sources beneath a red-colored heatsink attached to the amplifier. We use a fan as a cooling mechanism to push air and conduct heat away from the amplifier.
Objectives
- Define monitors to track flow and thermal parameters.
- Perform meshing operations for critical regions like the heatsink and fan.
- Submit and execute the job to ensure flow convergence.
- Analyze solutions to identify hotspots and validate the solution using AEDT Icepak's post-processing capabilities.
Monitor Definition
We will define monitors to track parameters as iterations progress, ensuring convergence. For example, we will:
- Assign a monitor to track the mass flow rate and temperature at a specific opening.
- Track the maximum temperature of a heat source device.
Meshing Operations
In AEDT Icepak, we have two meshing approaches:
- Automated Mesher: Suitable for simple geometries. Set resolution levels (e.g., 4 or 5) for finer mesh.
- User-Specified Mesh Controls: Allows for detailed control over mesh parameters.
We aim for a good quality mesh near critical regions to capture flow and thermal characteristics adequately.
Mesh Quality Checks
Before running the model, we check mesh quality using three criteria:
- Face Alignment: Should be over 5% (ours is over 60%).
- Volume: No negative values.
- Skewness: Should be over 2% (ours is about 7%).
Solution Setup
We set up the analysis with the following parameters:
- Maximum number of iterations: 300
- Solving for both temperature and flow (turbulent flow).
- Include gravity effects.
Executing the Model
We execute the model using a 24-core machine, monitoring for any warnings or errors. Initial results indicated potential issues with mesh resolution, prompting a remesh with adjusted parameters.
Post-Processing and Analysis
After achieving convergence, we analyze the solution data:
- Check residuals and thermal monitors for realistic results.
- Use field summary for temperature and velocity data.
- Visualize temperature profiles and flow fields using contour plots and section cuts.
Conclusion
The analysis provides insights into the thermal performance of the RF amplifier. Potential improvements include adding more fins or using a stronger fan in high-temperature regions. This concludes our presentation. Thank you for your interest, and have a great day!
Radio Frequency (RF) Amplifier Thermal Analysis with AEDT Icepak: Part 2 Hello, welcome to part 2 of our video where we're talking about setting up a RF amplifier model in AEDT i-SPAC.
In the first part of this project, we defined our geometry, built our RF amplifier box, and set up a cooling mechanism involving a fan.
In this video, we will: 1. Define monitors to track flow and thermal parameters. 2. Perform meshing operations with a good quality mesh near critical regions. 3. Submit and execute the job, ensuring flow convergence. 4. Analyze solutions to find hot spots and ensure the solution makes sense.
We will look at the flow field and monitor the mass flow rate and temperature using AEDT i-SPAC post-processing capabilities. Since we have a fan with a fan curve, we will examine the volumetric flow rate across the air domain.
In ADT Icepak, we will use the automated mesher with a resolution of four levels. We will then generate the mesh and analyze the quality, ensuring face alignment, volume, and skewness meet the required criteria. We will validate the setup and define gravity direction before executing the model.
We will analyze the solution data, checking convergence, thermal monitors, and flow. If needed, we will make corrections to the model, such as adjusting the total power per heat source.
Finally, we will perform post-processing using field summaries, temperature fields, and section cuts to visualize the thermal field and make informed decisions about the design.
