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Apply initial temp for a natural convection transient problem

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I am new to Hyperwork CFD and need help modelling a natural convection problem. A steel ball with an initial temperature of 100 C is being cooled with surrounding natural air. I want to study the time required to reach the temperature of the ball at 50 C. known parameters are steel properties, environment temperature, initial temperature, and convective heat transfer coefficient.

How to apply the boundary condition here, especially that initial temperature Can anyone please help me?

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HyperMesh CFD

v2021.1

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Jagan

Go to solution > Initialize > Part and specify an initial temperature of to solid.

It should be simple since you got the convective heat transfer coefficient, you won't have the model the surrounding air.

acupro

Go to solution > Initialize > Part and specify an initial temperature of to solid.

It should be simple since you got the convective heat transfer coefficient, you won't have the model the surrounding air.

It might even be easier than that. In the scenario you described - where you only have the steel ball with an imposed convective heat transfer coefficient and reference temperature - as Jagan mentioned you don't need to model the surrounding air. That would just be the boundary condition for the surface of the steel ball - the coefficient and reference temperature. You'll just have the steel ball as the only solid body. When you launch the solver you can indicate the initial conditions for temperature - and you can bypass the initialization per-part, since you only have that single part. (Run > opens the 'Launch AcuSolve' panel > expand the 'Default Initial Conditions' options.)

Ovando_RBB

Hi there,

As the whole body will be cooled down by the surrounding air, you can just simple use a heat transfer coefficient of 15 W/((m^2)*K) at the boundaries; that will get you a good estimation on the cooling time.

Hope this comment helps!