What is the difference between the RANS model and the Reynolds stress model?(a) The RANS model needs 5 extra transport equations(b) The Reynolds stress model needs 5 extra transport equations(c) The RANS model needs 7 extra transport equations(d) The Reynolds stress model needs 7 extra transport equationsThis question was addressed to me in exam.Asked question is from Turbulence Modelling topic in portion Turbulence Modelling of Computational Fluid Dynamics

What is the difference between the RANS model and the Reynolds stress

1.	What is the difference between the RANS model and the Reynolds stress model?(a) The RANS model needs 5 extra transport equations(b) The Reynolds stress model needs 5 extra transport equations(c) The RANS model needs 7 extra transport equations(d) The Reynolds stress model needs 7 extra transport equationsThis question was addressed to me in exam.Asked question is from Turbulence Modelling topic in portion Turbulence Modelling of Computational Fluid Dynamics
Answer» The correct answer is (d) The Reynolds stress model needs 7 EXTRA transport equations Explanation: The most common RANS turbulence MODELS are classified on the basis of the number of extra transport equations they NEED. These models form the basis of the CURRENT procedures for turbulence problems in CFD packages. The Reynolds stress model needs seven more equations.

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