A note on the turbulent energy as a parameter of turbulent flow

✍ Scribed by L. N. Persen

• Publisher: Springer
• Year: 1993
• Tongue: English
• Weight: 853 KB
• Volume: 14
• Category: Article
• ISSN: 0195-928X
• DOI: 10.1007/bf00502099

✦ Synopsis

The art of "modeling turbulence" is a needed tool in the construction of computer codes for turbulent flows. The state to which this art has been developed is inadequate, and quotations from authoritative sources support this point of view. The energy contained in the turbulent fluctuations, i.e., the turbulent energy, is often used as a parameter in the modeling process. The present article attempts to examine this quantity as it is being created, transported, and dissipated. For this purpose experimental evidence from the author's own experiments (free jets), as well as theoretical conclusions from the elementary deductions of the basic equations, the concept of turbulent potential flow, and a general solution to the Navier-Stoke~Reynolds equations, is drawn to attention. Recirculating flow is given special attention. The paper concludes with recommendations for principles that must be satisfied if improved modeling is to be achieved. These principles are necessary; whether they are also sufficient is open to question.