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Documentation

How to Visualize the Mesh in a PWC Analysis?

This article explains the steps required to visualize the mesh in Pedestrian Wind Comfort (PWC) analysis.

visualization the mesh resolution in pwc pedestrian wind comfort analysis on simscale
Figure 1: Inspecting the mesh resolution in a PWC analysis.

Solution

To be able to visualize the mesh in a PWC analysis (solver by Pacefish®\(^1\)), it is necessary to select an individual wind direction result.

Please visit the documentation page to learn more about the PWC analysis type. Additionally, this page explains the mesh settings in PWC analysis in more detail.

Note

Additional refinements are added in the leeward side of the buildings to accurately resolve the wake region. This refinement is adapted for each wind direction individually according to the wind direction. Consequently, you will see an individual mesh result for each wind direction.

Best Practices

1. Select the Mesh Result for a Wind Direction 

To see the mesh on the fluid domain for a given wind direction, first navigate to Mesh results, as seen in Figure 2:

inspecting voxel mesh results for a pwc analysis
Figure 2: The resulting mesh is different for each wind direction.

This will open the post-processing environment, where we can create filters. Cutting planes are very useful since it’s possible to plot the mesh elements on them.

2. View the Mesh Resolution on Cutting Planes

Once the post-processor opens, let’s first change the visibility settings, to ensure a clear view of the domain. Figure 3 below shows the best settings for this purpose:

control over the visibility of parts in post-processing while reviewing the results in the simulation
Figure 3: Controlling the visibility of parts in the post-processor. This setting will make the mesh visualization easier.
  1. Expand the Parts tab
  2. Hide all the parts by clicking on the ‘eye’ icon, except for the entry containing group-all-volumes

The best way to inspect the mesh is by creating cutting planes, and plotting the mesh elements on them. To do so, please follow the steps below:

creating a vertical mesh clip in pwc post-processor within the simscale platform
Figure 4: By plotting the mesh elements onto the cutting plane, we have a clear view of the mesh density.
  1. Click the ‘+ button’ next to Cutting Planes
  2. Change the Scalar to ‘None’
  3. For mesh visualization, it’s necessary to enable the Show element mesh option. Furthermore, disabling Clip model will give you a better perspective of the geometry
  4. Finally, adjust the Point placement and the Normal direction of the plane

Following the same steps above, you can easily create a horizontal mesh clip as well. Simply duplicate the first cutting plane and change its Position and Orientation:

creating a horizontal mesh clip in pwc post-processor in simscale
Figure 5: Duplicating an existing cutting plane and adjusting its orientation.

With these simple steps, we can evaluate the meshes from our PWC analysis type runs.

Did you know?

The sizing for the background mesh for the PWC analysis is highly automated. Often, the user does not need to do any mesh sizing other than adjusting the fineness from Moderate to Fine. Mesh sizing targets the specific use case, thus it works best for model sizes of 1 – 10 \(km^2\) and a region of interest radius of 200 \(m\) – 500 \(m\).

Note

If none of the above suggestions solved your problem, then please post the issue on our forum or contact us.

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Last updated: July 5th, 2021

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