Make the geometry ‘CFD ready’:
This is a thermal comfort project, which analyses the duct positioning inside a theatre space, in order to have an effective ventilation system. For thermal comfort studies, it is important to see Effective Draft Temperature (EDT) and Air diffusion performance index (ADPI). While the EDT provides a quantifiable indication of comfort, ADPI quantifies the overall comfort of space when in cooling.
Import CAD geometry. The supported formats are STEP, IGES, STL, SolidWorks, Autodesk Inventor, Rhino, Parasolid and ACIS.
Extract the fluid region by using geometry operations. A detailed tutorial is shown here.
Use the ‘Hex-Dominant (only-CFD)’ mesh. This is the most automated approach and is usually the best starting point. In mesh mode select:
Once the mesh is complete, check its quality with these two steps:
Note that if setup tasks are not mentioned below then default values should be sufficient.
Define Gravity based on its direction on your CAD model. Here we have this assigned in the negative y-direction:
Assign the standard air material to the fluid domain. Here is a short video on how to assign Materials to different parts of the model. Materials in the product library can also be customized as necessary.
Default values for initial condition parameters are usually enough. If these parameters estimated correctly, the solution will converge faster.
Flow inlet and outlet Boundary Conditions can be defined in the following ways:
Walls can be defined with specific temperature and heat transfer parameters.
While surface heat sources can be defined by fixed temperature or turbulent heat source, adiabatic conditions can be defined by zero gradient Temperature.
Leaving all other surfaces unassigned will mean that the default no-slip wall condition is applied.
Assign the following boundary conditions:
Boundaries can be selected in the following way:
Hide the duct walls (right-click, Hide selection), select the rest of the geometry (right-click, select all) and assign the wall conditions to the rest of the walls.
The default settings are usually suitable. Experienced users can use Manual settings for better convergence.
The Simulation Control settings define the general controls over the simulation. Apply the following controls:
For a general overview of SimScale online post-processing capabilities, the following documentation can be used: here.
This video shows how the velocity fields can be shown by cutting planes:
For thermal comfort studies, it is important to see Effective Draft Temperature (EDT) and Air diffusion performance index (ADPI). The inputs for EDT and ADPI calculation can be found under this link. The images below give the EDT (slice across the section and as threshold) values in the domain. These were created in Paraview.