Computational & Run Time requirements for CAA
Hi,
I'm a undergraduate student and I'm about to start a CAA research in CFX. I've no previous experience in this area, so in order to write my project I need to know the computational and run time requirements for a simple geometry. How many nodes would I need for a LES method? Please, any comment will be welcome. Thanks |
It depends on what you are modelling, of course.
But any LES model will involve large meshes and long run times. LES is very computationally expensive. |
Thank you Glenn Horrocks for your answer.
My first idea is to model an airfoil-slat geometry, but I thing I won't have enough computational resource to explore this problem in CFX, mainly because its iterative solver. Maybe a CAA designed software should allow me to do this. So in order to write my project I need to know what kind of geometry I will be able to explore in CFX. Thanks |
Basically in a LES simulation you try to represent directly the large scales and the effects of the small scales are modelled. The required grid spacing h is proportional to a specified filter width that should be smaller than the size of the smallest energy-containing motions. you can see an overview of all modeling approaches in Pope for example.
Regards |
Quote:
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Re~9e6 e Ma=0.3
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This is quite a high Re number, meaning that the turbulent structures will be quite small. On top of that you will have compressibility effects with Ma=0.3. This is definitely going to be a challenging model and will require a compute cluster of some size and lots of run time.
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Thank you Glenn Horrocks and Antonio for your answers.
I will change my initial idea and simulate a Mixing Layer, that can be interpreted as a very simplified model of slat. I'm sure that this will be possible to do. Best regards |
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