５．Creating the Volumes and Mesh
About the computational domain
n In ennovaCFD, we call the computational domain Volume.
n It is possible to use the FindVolume functionality to automatically find the volumes (see P17-19 for detailed information).
n In the current case, 4 volumes are automatically recognized.
n On the connection of 2 volumes, 2 surfaces with the same name are created.
n In ennovaCFD, we call these surfaces interfaces.
Rename the volumes as follows.
n Volume1 → FLUID Volume1＞FLUID
n Volume2 → HEAT (heat source)
n Right click on the volumes that need renaming to
Requirement of the STL file for automatic volume detection Volume interfaces need to be integrated to be shared surfaces.
CAD data STL file
Each Volume owns their The two volumes share own surfaces. one surface.
Requirements of the STL file for automatic volume detection
n When executing FindVolume, the shared interface between the two volumes is automatically copied to allocate to the two volumes.
STL file The outcome of automatic detection
One shared interface is copied to make two surfaces.
Requirements of the STL file for automatic volume detection
n On the interfaces created by FindVolume, continuous mesh is created across the shared surface.
The outcome of automatic detection Generated mesh
６．Setting of the mesh size
n Setting of the global mesh size
Details of the global mesh setting panel (1/3)
n In the current case we set the values as are shown in the red box.
①：Set the Max.Size to 10
Maximum mesh size for the model
①②：Set the Min. Size to 0.2 ② Mimimum mesh size for the model
Note： In ennovaCFD 1.5, the local mesh size can not exceed the maximum mesh size specified above. So, the maximum mesh size should be set based on the scenario that generate the largest meshes. Later, the mesh size could be refined using the local mesh setting.
Details of the global mesh setting panel (2/3)
n Set the values as are shown in the red box
①：Refinement num 200 fit ratio for the mesh on the curve surfaces See P25 for more details ②：Elements in gap -1 （default value）
① See P26 for more details
③： Search floor 0 (default) See P26 for more details
④：All Triangles off
If this option is turned on, the surface mesh will
② all be triangles.
③ If this option is turned off, rectangular meshes will ④ be created where possible, the other places will be
meshed with triangles.
Details of the global mesh setting panel (3/3)
n Set the values as are shown in the red box
①：Scale Factor 1 (default) Scale the specified mesh size ②：Expansion Factor 1.2 (default)
Expanding ratio of the volume mesh
③：select Surface+Volume Mesh(w/Prisms) Selection of the mesh type
n Explanation of Refinement Number and Sag Number
n Explanation of Element in gap and Search floor
Settings of the local mesh size and layers. (1/3)
n On the solid surface in the fluid volume, we set the local mesh size and the layers.
Settings of the local mesh size and layers(2/3)
n In Share_HEAT_SINK and Share_HEAT_SOURCE, we set the value of the local mesh size and the layers.
As for OUTLET and WALL, we do not perform local mesh settings. Settings of the local mesh size and layers (3/3) n In the solid domain, turn the layer mesh off.
②
