I need to simulate this in fluent.

Take a bubble of radius 1 mm with internal pressure as 3 kPa, while the outside liquid is at 1 bar pressure. This bubble is at a distance of 1.1 mm from a flat surface. Gravity acts vertically down.

the bubble is of vapour.

I used multiphase model with VOF.

I created a Rectangular domain to simulate it in 2D with suitable dimensions.

I am facing problems in setting up the pressure difference in and outside the bubble , like I used operation condition has 100kPa , and boundary conditions as pressure oulet for top, right and left side of the Rectangular domain , and wall for bottom side.

Then I patched the bubble with suitable radius, but I am not able to set the presure differnce .

Could anyone help me setting the pressure difference.

Artificial intelligence is changing our world as we know it. A storm of change concerns every field, everything, and everyone. In this little thought experiment, I would like to think about how our beloved Computational Fluid Dynamics (CFD) and CAE simulations are likely to change. I know, I know. Predicting the future is generally a foolish exercise, …, so I decided to write the following lines about it. Disclaimer: It’s March 2026. 

At the moment, AI is entering CFD through at least three distinct paths, each affecting engineering work in a very different way: Agents, Surrogates, and Coding. These three guys are already happening, and they are quickly changing CAE, and the pace is only growing. Let’s take a look at them one by one.

I need to learn how to model fire and explosion with cfd. Can any one help me?

Hi, wanted to do Drivaer estate simulation with rotating wheels, moving ground. So i started with tutorial from website, and used the same configuration as starting point, and Cd was way to low, then i changed to Kepsilon back and forth Cd was still low. then i switched to half of car and started to refine mesh and Cd went little higher to 0.3 but still it is inacurate, then refined further and Cd ramped to 0.38 then started to look on Y+ and further refined to achieve average 5, but most of car is 2, and still Cd is very high (0.37), tried also with LowRe wall functions but it seems that Cd is still too high. Any Ideas what to check/ to replicate good- consistent results? Experimental CD for estate is 0.314

Hello everyone, 

I have a recurrent problem when meshing with SnappyHexMesh: there are "holes" on some boundaries of my mesh (see picture). Do you know why this is happening? And what could I change to have a mesh that perfectly match with my geometry? I am working on a passage of a centrifugal compressor. 

Thank you in advance !

Alex 

Under development ...

TBRAIN is a new software module for TCAE, an intelligent autonomous agent that automates engineering simulation workflows (especially CFD).

Its goal is to eliminate the need for expert knowledge, drastically accelerate projects, and make simulation accessible through natural-language control, similar to ChatGPT.

Please be advised that our email notification system is currently undergoing a complete redesign to improve reliability and integration with the new TBRAIN architecture. We are working to ensure that automated updates and alerts are fully functional ASAP. Thank you for your patience as we finalize these enhancements.

I am running the Ahmed benchmark case downloaded from cfdsupport, and I get a different drag coefficient compared to what is in the report on the website (experimental value: 0.2850, website value 0.2848, my value 0.305). This is a fairly significant difference. I am using the files exactly as downloaded, in TCAE-Lite version 25.10. What would be the reason for this difference in drag prediction?

Hello,

I am interested in the Axial Fan TCAD geometry builder mentioned in this example:
https://www.cfdsupport.com/axial-fan-design-and-simulation/

Can someone in the forum clarify whether the TCAE-Lite version provides access to this geometry builder, or if the full TCAE package is required?

Thank you for your help!

Daniel Garcia

I have a pre-built mesh in cgns format which consists of a half-wing, symmetry plane and a half-sphere as the outer boundary. I can successfully import the mesh into TCAE-Lite. I want to set the half-sphere up with a freestream boundary condition (so that it can act as inlet and outlet), but there seems to be no option for this. Is there any way to run this type of geometry in TCAE-Lite, or do I need to physically split the half-sphere boundary into an inlet and outlet portion? Note that it is important that the volumetric mesh is kept as-is (the intention of this work is to look at results from different codes using the same mesh).

Hello everyone,

I have trouble initializing a case using a previous result when I try to run a simulation with the remote computing strategy described in Chapter 7 of the TCAE manual. The graphical interface doesn't allow me to select the source case from the remote machine's files. However, I can do this without any problem when running the same case locally.

Is there a specific procedure for doing this remotely, or is this a bug?

Thanks in advance!

Zacharie

Hi everyone,

It seems to me that the field bounding limits are only applied in stationary simulations, and not in transient simulations. Indeed, in one of my transient tests, many cells of my domain reach values (the velocity in my case) well above the max velocity indicated in SIMULATION/Controls.

Are you aware of this comportment ?

Thanks in advance !

Zacharie

Hello everyone,

I have some questions regarding case initialization:

1) In steady-state simulations, I assume that the conditions defined in the "Initial Conditions" section are only used to initialize the first point of each speedline, and that subsequent points are then initialized from the previously calculated point in the speedline. Is that correct?

2) In transient cases, a new option appears in the "Initial Conditions" section: "Initialize points from the previous point." What happens if this option is not selected? Is each point then initialized with the conditions defined in this section, regardless of its position in the current speedline?

3) Do you recommend simulating the speedline from the highest flow rate to the lowest flow rate, or the other way around (in the case of a centrifugal compressor for example) ?

Thanks in advance!

Zacharie