Mesh Expansion


Users may opt to track a concentration (percent volume or ppm) of a component or gas during a dispersion simulation. This will notify in:Flux to automatically expand the mesh and domain to follow the specified concentration value.


To enter a concentration to track, open the Mesh Expansion section when defining a new dispersion case and set the Expansion dropdown to At Concentration. Note that the Inflow with the desired component or gas must be selected for it to populate the Fluid dropdown menu.


Using the Tutorial 7 save file, the below figure shows that for the HP Release with H2S multi-component gas mixture, we can setup a new dispersion case and track a specific particle. Click the Mesh Expansion arrow option and change the Expansion dropdown menu to be At Concentration. This will enable you to set a specific concentration to follow for the bulk mixture, Methane, Ethane, Propane, or Hydrogen Sulfide.


This example will set the Fluid to Hydrogen Sulfide.



Once the Mesh Expansion Fluid is selected, a concentration may then be entered. Below shows how the dispersion simulation can be set up to track and follow a 2ppm concentration of Hydrogen Sulfide throughout the domain. To switch from %vol to ppm, mouse over the variable and click to open the dropdown menu, as shown below, for selecting the other variable.




Click the Add Item button and the dispersion will begin to calculate or will be added to the Simulation Scheduler. Selecting the dispersion case will open its properties panel, the red arrow in the figure below shows where the tracked concentration is listed in the Mesh section of the properties panel.



As the dispersion is being calculated the domain will expand during each mesh adaptation to track the 2ppm H2S concentration. Below is a series of images showing the mesh at 4%, 57%, and 100% completion stages.


Mesh and domain sizing at 4% completion of the simulation


Mesh and domain sizing at 57% completion of the simulation


Mesh and domain sizing at 100% completion of the simulation