Learning Forum

[Yahya Balouchi]

Hello 

I'm currently using AQWA for analyzing fluid sloshing dynamics, and had a question about the possibility of modeling a partially-filled 3D tank geometry.

Specifically, I would like to model a tank that is half-filled with liquid to capture the sloshing pattern and shifting center of gravity as the tank moves. However, I understand AQWA is limited to only line bodies and surface bodies representing the fluid domain. So I have two questions:

Is there any way to approximately model a 3D solid tank geometry partially filled with fluid in AQWA? Or any recommendations on best practices for modeling a coupled fluid-solid system like this?

 And does ANSYS have the functionality to perform 2-way coupling between Fluent and Aqwa?

[Shuangxing Du]

In Aqwa, either the internal tank liquid level or the fluid volume can be deined for the partially-filled 3D tank. The surfaces of the tank will be meshed, and the meshes below the mean liquid level will be considered as diffraction panels, the meshes above the mean liquid elevel will be treated as non-diffraction panels.

Aqwa only needs the surfaces of the internal tanks and external hull for the hydrodynamic analysis including the couplying between tanks' fluid motions and the motions of the vessel.  The fluid potential theory is applied.

There is no Fluent-Aqwa cosimulation.

[Yahya Balouchi]

Thank you for your response. 

Since there is no direct two-way coupling between AQWA and Fluent, I would appreciate if you could provide guidance on the best approach to export the sloshing pattern computed in AQWA and incorporate it into Fluent.

Specifically, I would like to know if there is a way to:

1. Export the time-varying sloshing motion (e.g., fluid velocity, pressure, or wave elevation) from AQWA as boundary conditions that can be imported into Fluent.
2. Export the initial fluid flow field (velocity, pressure, and volume fraction fields) from AQWA at a specific time instant and use it as initial conditions in Fluent.
3. Explore any third-party coupling tools or custom scripts that could facilitate the data transfer between AQWA and Fluent, if available.

[Shuangxing Du]

Aqwa calculates the time domain pressure over the internal tank hull, but does not calculate the fluid velocity, wave elevation inside tank.

The results can be exported into a common-separated values file. Please read Aqwa User's Manual, Section 5.11.9 Time domain Pressure Results.