I am having difficulties trying to model this thermosyphon (attached pic) on ICEM CFD. I need to draw it, apply meshing, and then simulate it with different properties each time.
For drawing you can use ANSYS workbench, if geomerty is to difficult to do in ICEMCFD. But if you can come up with the co-ordinates for each point then it can be drawn in ICEM only. For meshing use blocking. You can block the seprate smaller and modular region seprately. And for simulation you can use fluent.
ICEM CFD is not projected to draw, the geometry tools are addressed to geometry repair and defeaturing, auxiliar point and lines. As Ashawani wrote, you can use it to draw simple geometries, but is not a good tool for this. But is possible and fast depends on the case.Your geometry is very simple, so I'll reinforce the Morteza advise: try some simple tutorials, there are lot of them in youtube. CFD online is a good source of tutorials and material to ICEM and other CFD tools.