Using multiscenario to model different cloud sizes and ignition locations in an explosion modelling project
- 21 May 2025
- 1 Minute to read
Using multiscenario to model different cloud sizes and ignition locations in an explosion modelling project
- Updated on 21 May 2025
- 1 Minute to read
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The following section provides a walk-through of a multiscenario project setup to define variations of an explosion scenario. The intention is to demonstrate the capability of the multiscenario function to easily create simulations with varying ignition locations and cloud sizes.
The explosion scenario consists of two gas cloud sizes positioned around the same equipment with two ignition locations for each cloud. This type of variation is frequently performed when an explosion analysis is based on the results of a dispersion study (i.e., multiple hole sizes or wind conditions for a release from a piece of equipment or piping resulting in multiple different cloud sizes).
Explosion simulation at a refinery
Varying cloud size
Add cloud dimensions node: by right-clicking on the desired node in Graph View and selecting Cloud Dimensions.
Input cloud dimensions: create a clone of the cloud dimensions node (right-click, Clone) select both cloud nodes and input the cloud dimensions in Node Properties (sizes 2×2×2m and 5×5×5m for Cloud Dimensions 0 and Cloud Dimensions 1, respectively).
Ignition locations
Multiple ignition locations are often applied in order to represent different pieces of equipment that may act as a source of ignition as well as for sensitivity tests in order to find the worst-case ignition location scenario.
Add an ignition location nodes: the smaller cloud is selected and an ignition location node is added via right-click, Add -> Ignition Location. The ignition location node is cloned and the actions are repeated for the larger cloud node.
Defining ignition locations: the two ignition locations for the smaller cloud are selected, the ignition positions are defined in Node Properties. These represent lower and upper corner ignitions. Following the same procedure, the two ignition locations for the larger cloud are defined.
Save the project and export scenarios
Save the project: via File -> Save. The project is then saved as a thf file.
Export all scenarios: select Export all scenarios in the Table View.
Walk-through video
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