[Duranin]

Yes, this is exactly what I want.

I thought I'd tried two opening using SBC-'outflow with backflows' but it gave an opposite flow against the physics. Perhaps I did something wrong; I will go through your model carefully to see if there are something I missed.

Thanks so much for your kindly help!

Originally Posted by hellorishi

Just copied the BC settings from upper opening to lower and its working.

https://docs.google.com/file/d/0B9k4...it?usp=sharing

Is this something similar to what you expect?

[hellorishi]

This model has hydrostatic pressure setting enabled at both outlets.
Also a steady state solution was used a initial value for transit run.

[Duranin]

This hydrostatic pressure is interesting. Actually I've tried to apply a p*g*h pressure on lower opening. I thought the it is too sensitive to impact the results since for air p*g*h is so small and also it is not practical if I have some openings that are not parallel to the reference. Now it makes sense.

I have used SC-Tetra before and it seems that SCT will automatically take into account for hydrostatic pressure.

Thanks a lot for your help

[hellorishi]

Some notes about Hydrostatic Pressure from the AcuSolve Command Reference Manual:

"If gravitational force is modeled using the GRAVITY command, then hydrostatic_pressure=on should be set for most pressure or stagnation pressure boundary conditions in order to properly account for the hydrostatic pressure. This is most commonly needed on outflow boundaries."

[hsirah]

Just a quick question about this simulation. Were you able to see mass conservation between the inlet and outlet? From the velocity vector plots, it looks like the velocities are much higher at the top than at the bottom. As i have not run this simulation, i have not taken a look at the results. My conclusions below are based on the plots you have shown.
As the mass flux over a surface area is (density x area x velocity), it does make sense that velocities are higher at the top. However the magnitude of difference between the inlet and outlet does not seem to match the expected difference in density.

[hellorishi]

Mass conservation was pretty good. See the screenshot of mass flux at those surfaces.

Since both the top and bottom were "open" boundaries and not specifically inlet or outlet, there are some regions at the top where there is mass coming into the box.

[dineshkanthtp]

How u are seeing the results in Acusolve.Do we have go for Post Processing tool?

[val46]

Within the Hyperworks suite you can use Acufieldview or Hyperview.

[Pradeep Kumar S]

Hi Hellorishi,

I have started using AcuSolve for CFD analysis. I need to give a batch run(consisting of different cases). I found that .inp file should be used for giving batch run but AcuSolve is not generating .inp file in my case. What should I do to get that .inp file?

Thanks in advance!!!

Cheers,
Pradeep

[hellorishi]

Hi Pradeep,
Are you using AcuConsole or HyperMesh to generate the mesh and export .inp file? Are you getting any error message, while exporting the file?
Your local Altair Support might be able to conduct a webmeeting with you to find out the exact reason. Where are you located ?

[Pradeep Kumar S]

Hi Hellorishi,

I used hypermesh to generate the 2D mesh and generated 3D in AcuConsole only.

I figured out how to generate the .inp(input file). It was near the generate mesh icon.

Altair support helped us in fixing it.

Thank you so much for your reply.

Cheers,
Pradeep

[ViLaks]

Hi Everyone,

Im pretty new to FEM based CFD and Acusolve. I did a few tutorials (Manifold and Elbow). I am curious about the lack of P-V coupling algorithms. Is it in built in Acusolve or is there no need for that in FE based CFD? Might be a lame question, but I need to know

Regards
Vignesh

[hellorishi]

AcuSolve has a coupled pressure-velocity solver. You can see that in the Log file as "flow" equations residuals ratios.
The coupling of temperature and flow, is optional. It depends whether flow and temperature needs to be coupled (natural convection) or not.

[hellorishi]

Also if you are trying any new tutorials make sure to use HyperWorks CFD or SimLab interface and not HyperMesh or AcuConsole. New features are being released in HyperWorks and SimLab.

[ViLaks]

Hi Rishi,

Thanks for your reply. Let me explore the solver controls.

I am indeed using HW-CFD

[ViLaks]

Hi Everyone,

Is there a way I can define an interior wall in acusolve, just like we do in Fluent?

Regards
Vignesh

[hellorishi]

HI VIgnesh,

If you are using HyperWorks CFD (any version) or SimLab 2020.1 onwards, then there is something called as AutoWall that takes care of the interior surface, automatically. There is generally no need to explicitly define such interior walls, unless you want to specify some extra BC like additional heat flux on that wall.
What are you trying to achieve with this interior wall? Is it for evaluation? Or is just a wall at the interface of solid-fluid?

[ViLaks]

Originally Posted by hellorishi

HI VIgnesh,

If you are using HyperWorks CFD (any version) or SimLab 2020.1 onwards, then there is something called as AutoWall that takes care of the interior surface, automatically. There is generally no need to explicitly define such interior walls, unless you want to specify some extra BC like additional heat flux on that wall.
What are you trying to achieve with this interior wall? Is it for evaluation? Or is just a wall at the interface of solid-fluid?

Hi Rishi,

I am simulating flow through a pipe. I need to check, if the fluid
(water) hits a target kept at a distance from the pipe. In this case, I cannot define the outlet of the pipe as outlet right. If it is so, I cannot see if the fluid hits the target. Hence, I need to define this face as interior, so that I can measure velocity and pressure at this face (during postprocessing), and also can see if the fluid hits the target. My target will be the outlet in this case.
I need to do this in acuconsole/hypermesh.

Regards
Vignesh

[hellorishi]

In AcuConsole it is easy, just disable the Simple BC and keep the Surface Output active for that surface. Here is a screenshot.
BTW, I would be curious to know any particular reason you would be still using HM or AcuConsole and not the new interfaces?

[ViLaks]

Originally Posted by hellorishi

In AcuConsole it is easy, just disable the Simple BC and keep the Surface Output active for that surface. Here is a screenshot.
BTW, I would be curious to know any particular reason you would be still using HM or AcuConsole and not the new interfaces?

Thanks for your reply. Its actually for a client and not for me