Estimating the Transient Response of an Electronic Assembly - Ansys Icepak
Introduction
In this tutorial, we will solve the problem of estimating the transient response of an electronic assembly using Ansys Icepak. We will walk through setting up the solution parameters, running the simulation, and analyzing the results.
Solution Parameters
- Set the basic parameters:
- Call 100 iterations and accept the settings.
- Ensure temperature and flow are solved.
- Turn off radiation.
- Use the zero equation model for turbulence.
- Set up as a transient problem.
- Configure the transient case:
- Start at 0 seconds and end at 20 seconds.
- Set the time step size to 1 second.
- Save the solution at every 10 intervals.
- Adjust basic settings:
- Set the number of iterations per time step to 20.
- Ensure the default setting is transient, allowing power to change over time.
- Use a square wave pattern for power: on for 5 seconds, off for 5 seconds.
Monitoring and Running the Simulation
- View transient settings to observe DDR power variation.
- Select DDR1 and create a monitor point:
- Create a point named DDR1.
- Modify the point type to monitor temperature only.
- Save the project.
- Run the calculation and start the solution.
Results and Analysis
At the end of the 20-second analysis, observe the following:
- The temperature in the DDR RAM increases when the power is on and decreases when the power is off.
- This cycle repeats as the power toggles on and off.
Post-Processing
- Review transient settings:
- Set the value increment to 1 (matching the time step size).
- Create history plots:
- Specify start and end times.
- Use the existing DDR1 point or create a new point by adding a location.
- List these points in the history of the tunnel.
- Click on Create to visualize temperature changes over 20 seconds.
- Generate a summary report:
- Create a new object, e.g., DDR1, and write the file.
- Review how temperature changes at different time values.
Conclusion
Thank you for your time. We look forward to seeing you in the next tutorial.
Estimating the Transient Response of an Electronic Assembly - Ansys Icepak Now we are going to solve this problem. Let's move to the solution parameters. Basic parameters: call 100 iterations, accept. Go to basic parameters. We'll solve the temperature and flow. Radiation is off.
We'll use the zero equation model for turbulence. We'll set it up as a transient problem. Let's run a transient case starting at 0 seconds, ending at 20 seconds. Set the parameters so the time step size is 1 second, and we will save the solution at every 10 intervals. Move to basic settings now.
The number of iterations per time step is set to 20. The default setting is set to a transient setting. That means the power can change over time. For 20 seconds, it will be using a square wave pattern, so it will be on for 5 seconds and off for 5 seconds. Go back to basic parameters.
Go to View, Transient Settings, and you can see how the power of the DDRs is varying. Now, select DDR1, and let's create a monitor point. We will create a point, DDR1, and we can see the point over here. Modify the type of point; in this case, we are going to only monitor the temperature.
Save the project. Go to Run Calculation, and start the solution. Here, we can see that at the end of 20 seconds of analysis, the temperature in the DDR RAM increased whenever the power was on and then decreased as the power shut off. And again, it increased and decreased when the power shut off.
Let's create a post-processing phase. First, look at transient settings. I value increment to 1; that means simply go forward by one second, that's our time step size. Click on Forward. Next, we are going to create History Plots. Post History Plot. Here, we can specify a start time and end time.
At a point, we already have one point, which is our DDR1 point. Or you can create a new point by adding a location. Creating a new point and selecting another object. Now, we have two points. This point will be listed in the history of our tunnel.
Click on Create, and it will show you how the temperature rises on these points over 20 seconds. You can go to Report, Summary Report. You can put the report form for all the times. Create a new object, let's say DDR1, and write the file.
You will be able to see how the temperature changes at different time values. Thank you for your time. We'll see you in the next tutorial.
