Learning Forum

[Noused]

I want to see the fluid weight effect to the 2D axisymmetric model, so I use the fluid

acceleration. but, why the hydrostatic acceleration of the fluid have to be 9.81 to positive Y

direction? I think -9.81 to Y direction, but if I use that value, nothing happened.

why this situation happened?

 

[Sandeep Medikonda]

Noused, When you say "nothing happened", what does that mean? Does it not take the values you input? Or it doesn't show the results you expect? If it is the later, what is you expectation from this?

As far as the specification of this boundary condition is considered, please see here.

Specify the magnitude and direction of the Hydrostatic Acceleration. This is typically the acceleration due to gravity, but can be other acceleration values depending on the modeling scenario. For example, if you were modeling rocket fuel in a rocket’s fuel tank, the fuel might be undergoing a combination of acceleration due to gravity and acceleration due to the rocket accelerating while flying.

acceleration can be used to simulate gravity (by using inertial effects) by accelerating a structure in the direction opposite of gravity (the natural phenomenon of). That is, accelerating a structure vertically upwards (+Y) at 9.80665 m/s2 (in metric units), applies a force on the structure in the opposite direction (-Y) inducing gravity (pushing the structure back towards earth).

Regards,
Sandeep
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