I am simulating a system that has flow ranging from laminar to turbulent conditions (up to a Re≈10,000). For my analysis, I have to use a k-e model for various reasons. From some preliminary testing, it seems like some of the k-e turbulence models predict turbulence setting in too early as I ramp up the Reynolds number. Is there a specific wall function or k-e model I should use to better predict this laminar-turbulent transition region?
k-e model for the transition region
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- Last Post 09 April 2019
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Do use the omega based transition models. If your device Re is already large just use full turbulent model (SST or GEKO). Stick into first node at yplus=1 And at least 15 cells across BL.
Some of my UDFs use k and epsilon, which is a major reason I was sticking to the k-e models. It seems like I can still access epsilon while using the omega-based models. That also seems to be true with the SST model. Is that correct? Do I need to change anything in my UDFs to switch from k-e models to k-w/SST models?
Check if the variable is available to avoid any crash. If not available you need to calculate it and adjust.
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