Learning Forum

[Johndm]

I have a closed system with a heated plate submerged in a liquid (2D). A heat flux is applied to the plate walls and the walls of the enclosure have a constant temp BC. The Boussinesq model is used and confirmed to be valid since my temperature gradient is small.nIn the user guide it states If the density is assumed constant or if it is derived from a profile function of temperature, the operating pressure is not used in the density calculation. nSince the Boussinesq model treats density as a constant value in all equations except for the buoyancy term in the momentum equation (which is not a function of pressure), does the operating pressure defined in Operating Conditions effect the solution? n

[Amine Ben Hadj Ali]

No. n

[Johndm]

If I want to study the effects of pressure on the model, is the only way to do that by inputting the values (fluid properties, temperature) at the desired pressure?n

[Rob]

With a gas you can use ideal gas and the system will pressurise depending on the calculated temperature (and initial mass in the system). Liquids are more complicated as the compressible liquid model has limitations. nWhat are you trying to replicate? n

[Johndm]

Just trying to see if pressure has any effect on the buoyancy driven flow velocityn

[Rob]

Only if it has an effect on the density gradients: in terms of modelling you could look at the material to see if the expansion coefficient isn't linear with pressure n

[ammar laichi]

how to set boussinesq hypothesis in ansys fluent?