Information about Fluent Equations from Theory Guide
soloviev
Member
Hello,
I am interested in some things that I could not find in the theory guide:
 Gravity is set in operating conditions, and is not included in equations such as the NavierStokes equation in the LES model. How do these interact to ensure the eddies are influenced by gravity in the model?
 In the VOF model, the incident wave profile uses Kx and Ky, which are defined as Kx=kcos(theta) and ky=ksin(theta). I can't find what theta is defined as anywhere in the theory guide for these equations?
 For the wave frequency in the open channel flow, it says U is the uniform incident wave velocity. I see no further explanation on how this was defined?
Thanks,
Alex
Best Answer

DrAmine GermanyForum Coordinator
Gravity term is treated as source term. Once activated Fluent will redefine the pressure as documented in the Pressure Inlet description.
Theta is the angle between the wave front and reference propagation direction (the latter default is flow direction). Zero being the default
Vector U the referring the main flow velocity (background velocity) like you have 5 m/s of bulk water flow flowing in certain direction
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Answers
Gravity term is treated as source term. Once activated Fluent will redefine the pressure as documented in the Pressure Inlet description.
Theta is the angle between the wave front and reference propagation direction (the latter default is flow direction). Zero being the default
Vector U the referring the main flow velocity (background velocity) like you have 5 m/s of bulk water flow flowing in certain direction
Thank you.
This answered my questions!