Basic model analysis

In the previous tasks, you prepared the tutorial model for analysis. You selected a material, designed a multi-cavity mold, modeled the runner system and cooling system, and launched the analysis.

alert icon Download the files for this tutorial from Autodesk Knowledge Network - Setting up a Multi Cavity Fill analysis tutorial.

In this task, you will:

Examine the information generated by the analysis.
Examine the graphical representation of the analysis results.
Determine the result value at a selected point on the mold.
Look at a brief description of some of the major results.

There are two main sections of the workspace that provide detailed information about the analysis.

Study Tasks pane - Results

A Fill analysis was run for this study. Over 25 different results are available. These range from Fill time to Shear stress at wall. If a different Analysis sequence was selected, such as Fill+Pack+Warp, an extended set of results is presented.

The Fill analysis was based on the default process settings for the selected material. You can edit these default process settings in the Process Settings Wizard to reflect the actual manufacturing settings. If you change process settings, you must run the analysis again for the results to be updated.

Logs pane

Analysis information is provided in the logs pane. There are four tabs for the Fill analysis being considered.

The Mesh Log tab summarizes any mesh alterations undertaken in the study with the parameters used to generate the mesh. As there have been no alterations, this tab is blank.
The Analysis Log tab records the analysis inputs, the progress of the analysis, and some key results. If any warnings or errors occurred, they are displayed in the Analysis Log. There is a warning about the low mesh match percentages.
The Fill tab presents the analysis inputs and the summary results, including bulk temperature, shear stress, and frozen layer fraction at the end of the filling stage. The low mesh match percentage is also reported in this tab.
The Fill-Check tab presents the results of the checks performed at the beginning of the analysis.

Open the Modeling tutorial project you created previously.

Continue with the model from the previous task, or download and analyze model_4_analysis.sdy.

To download the study:
1. Click (Home tab > Import panel > Import).
2. Select the Files of type drop-down list. The list of file types directly supported is shown. Select Study files (*.sdy) .
3. Navigate to where you saved the tutorial files.
4. Click the file model_4_analysis.sdy and click Open.
  
  In this study, a Fill analysis has been completed on the model from the previous task and results are available for review.
To view a result, click the checkbox next to the result name in the Study Tasks pane. The result will be displayed graphically in the Model pane.

Tip: To view the exact value of a result at any location on the part, click (Results tab > Examine panel > Examine), and click on the model.
To view the full list of results from the analysis and/or create a customized version of any of the results, click (Results tab > Plots panel > New Plot).

You will look at altering the format of these plots in the Postprocessing tutorial.
Select Logs from the Study Tasks pane to show the Logs pane.

Autodesk Moldflow Insight gives detailed information about the part design, material, and processing conditions used in the simulation.

Some of the Fill analysis results available are listed below.

Fill Time: The Fill time result shows the flow path of the plastic through the part. This result can be animated against the time required to fill the part.
Pressure at V/P switchover: The Pressure result shows the pressure distribution through the flow path inside the mold at the switchover point from velocity to pressure control.
Average velocity: The Average velocity result plot displays the flow direction, and the average magnitude of velocity of the polymer inside the mold cavity.
Orientation at core: The Orientation at core result is created at the end of a filling analysis and provides a good indication of how molecules or fibers would be oriented at the part core when using a fiber-filled material.
Time to reach ejection temperature: The Time to reach ejection temperature result shows the time taken for the part to freeze to ejection temperature, measured from the start of the cycle.
Bulk temperature: The Bulk temperature result displays the weighted average temperature across the thickness of the part at the time the result was written. Bulk temperature represents the energy that flows through a particular location.
Weld lines: The Weld lines result indicates the presence and location of weld in the filled part model. Weld lines appear as black lines on the model, and can indicate weakness. To see all of the weld lines, you may need to rotate the model.
Air traps: The Air traps result shows the regions where the melt stops at a convergence of at least two flow fronts, or at the last point of fill. The regions highlighted in the result are positions of possible air traps. To see all of the air traps, you may need to rotate the model. Air traps appear as large red outlines on the model.

The Fill Time and Pressure results are good starting points when checking the results of an analysis. They will show you where there may be filling or pressure distribution problems associated with the part design. If problems are indicated, you may need either to change the part design or use a different combination of material and processing conditions.

The results in this study indicate a good fill pattern and part design.