Autodesk CFD 2014 Free Surface

[Anonymous]

Hello, I was trying to do the Free Surface tutorial, but I cant find where to set up the HOF in the initial conditions.

Thanks

[Jon.Wilde]

Hi Fathur,

What is your question here? Have you made a start and not seeing what you expect?

Did you check out the Free Surface section of the help?

Thanks,

Jon

[Anonymous]

Hi Jon,

Thank you for your quick response, I want to simulate liquid movement within Tanks, I create Tank model in inventor consist of two part, tank and water as content

And then in Sim_CFD , after I defined material for tank and its content, steel and water. Then go to solve, anable free surface, defined grafity and acceleration.

I can't see display of water movement.

And my second question, is it pissible to sumulate ship movement on wave of sea water? and simulate pressure on ship panel/wall?

Thank you for your attention

Fathur

[Anonymous]

Hi Jon,
Continue to my 2nd question, I can't not modeling vessel above water, I can only simulate movement of vessel under sea level. please advice.

Thank you

[Jon.Wilde]

Are you able to share a CFZ file? It sounds like you have the right approach.

Yes, we are able to model ships, both above and below the waterline.

[Anonymous]

Hi Jon,

Here is my cfz file

[Jon.Wilde]

Hi Fathur,

There are a few things to change here, assuming this is the boat model, which it looks like:

1. Can you suppress the concrete part around the liquid? Not sure of its purpose. Also suppress the boat.
2. There are no Boundary Conditions - these would be applied to the lower water part only
3. You need to model the air part - although this will be assigned 'water'
4. Assign an Initial Condition to the Water only. This will be Height Of Fluid, and this is how CFD differentiates between it and the air above
5. Extend the outlet, it needs to be longer than your current inlet
6. Check out the Free Surface Help
   
7. You are going to need a much finer mesh, we often use a region in-between the water and air to capture the interface properly

Regards,

Jon

[Anonymous]

Dear Jon,

Can you please explain more detail:

no.2. what the meaning 'would be applied to the lower water part'

no3&4 .Whether to model the air part using HOF ?

Thx

Fathur

[Jon.Wilde]

Hi Fathur,

This is all in the guide.

You make both air and water parts just 'water'

Then you set the real water part (at the bottom) with an Initial Condition 'HOF' and this will be 100% full of water at the beginning of the analysis. The other part (the air) will be empty and so, will be treated as air.

[Anonymous]

Hi Jon,

Thank you for your suggestion, my study are now runnung well,

But sorry to bother you again, last question, can you check my cfz file.

I have simulated solid movement on water, but why the solid model divided/separate into two parts ?

Thank you