[TeresaT]

Hello everyone!

First things first I am a student from Germany with just a little bit experience with openFoam. I will always be thankful if you answer with links to pages where I can find answers as i tried to find them without luck so far. Even tips on what keywords will work, or which book to read will be welcome.


The Problem:
snappyHexMesh runs and runs and runs.. way over 12 hours so far

The goal:
To set up a kwSST Case to simulate the flow around the "Berliner Fernsehturm" the tv tower at Alexanderplatz, Berlin, Germany.

The case right now:
For my first attempt with snappyHexMesh I made a imprecise stl of the tv tower and i used the motorbike example files. A few times snappyHexMesh worked well however I made mistakes and ended up with a mesh that contained only a few parts of my tvtower.stl. I was able to find a solution on my own. The tvtower is now located in the middle of my blockMesh generated block, just where I think it should be. The mesh of my block is already quite fine.

My General questions:

1. mesh of the outer block:
Does the amount of cells interfere with snappyHexMesh?
Is there a rule to identify the number of useful cells?

2. stl-File:
What can I do to improve my stl file?
What´s easier to mesh? Sharp edges or smooth roundings?
Right now the stl contains both, should I change it to one type only?

3. Further readings:
Can you recommend a book fur further readings?
One with a highly detailed chapter about snappyHexMesh?

Thanks to everyone who has read so far, every hint is welcome.
Greetings,
Teresa
Ps.: Prior cases using only blockMesh and laminar flow worked well so far.