The Clash Detection feature of Design Validation in ProjectWise365 enables you to check models against clashes, visualize those clashes, and initiate the resolution process. 

Clash detection tests are created by selecting data and putting them into two sets. Once the sets are defined you can run the tests, and the system will visualize any interference between both sets. Clash can be checked against models (Architectural vs Structural) or between categories (Walls vs Columns).

Clash issues are visualized and can be reported back into the design applications (e.g. MicroStation) through the Issue Resolution Service.

The test created can be saved and you can choose to re-run them again anytime.

Creating a clash detection test goes through 4 steps:

A- Selecting the iModel

B- Selecting the CAD models and/or categories to be included in the clash run as Set A clashed against Set B

C- Review the sets

D- Define the Clash Run Parameters

E - Define the suppression rules

After running the test, you will receive an email confirming that the test is complete. You will be able to visualize the results. A resolution process can be initiated from within the tool, where the clashes can be assigned to the appropriate person through the Issue Resolution Service and can be reported back into the native design application.

Clash Run Parameters

Parameters	Descriptions
Clearance	The minimum distance apart two elements must be to *not* be considered clashing. If two elements are within this distance, they will be reported in the clash report. This can be different for each set; if two elements from different sets are being checked for a clash, the larger value will be checked against. A clearance value will be supplied in results, giving the distance between the elements.  If both clearance and suppress touching values are specified in a clash test, the clearance option is given priority.
Suppress Touching	When this is true, the results will not include elements that are touching, or whose clash overlap falls within the touching tolerance limits.
Touching Tolerance	Elements that are overlapping by less than this amount will be suppressed.
Self-Check	Whether elements in clash sets should be checked within a set-in addition to against each other. This is determined per set and can be mixed. If you have a single set that is self-check that is considered a valid clash test.
Include Reference Models	Includes hierarchical partition sub models of any model selected for a set. Otherwise, only elements that fall directly under the specified models will be included.
Calculate Overlap	For this feature, overlap distance is calculated for each of the six orthogonal directions, and then the minimum of those is taken as the clash overlap value and returned in clash results.
Validate Touching Tolerance	This feature is only available if calculate overlap is turned on. There are cases where unique element geometry can cause issues correctly suppressing cases less than the touching tolerance. When it is on, the overlap value will be compared to the touching tolerance, and cases where the overlap is lesser, the clash will be suppressed.
Long Clash	This will allow a clash to continue if it would take more than the default timeout limit.

For more information, please refer to this video Clash Detection in Design Review.