First CFD Simulation with BIM HVACTool and OpenFOAM
1. Basic infomation
1.1 Program start
After installing BIM HVACTool, start icon appears on the desktop.
Sie Now you have option to create a new project, open other project already saved in list, or open a project via Explorer. A project file of BIM HVACTool has has a * .hvac file name extension.
After clicking New Project button, explorer window will be opened where you can select project location. In addition to * .hvac project file, a folder with same name will be created, which has OpenFOAMâ folder structure.
2. Tutorial Room 3D
In this tutorial, we want to put together 3D space for OpenFOAM. For this purpose, we will import 3D geometries as IFC format, which set and connect boundary conditions. A heating element is used to heat room air, which is placed centrally below outer window. Furthermore, we need a refinement box because distance to outside wall is 4cm. Simulation is solved with stationary solver with Boussinesq-approach for air density. For evaluation we use ParaView.
2.1 Definition of initial and boundary conditions
Initial and boundary conditions are described below:
2.2 Import geometry
After opening file, you will be asked if you want to combine different materials in IFC file. Advantage is that graphics card can process 3D data more smoothly than single 3D models. Disadvantage: You can only set single boundary condition for OpenFOAM, since each boundary condition requires its own model.