User Defined Function (UDF) for pressure outlet in Fluent

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Do we need a UDF for transient compressible simulation in Fluent?

I observed in some manuals and websites for performing transient simulation in Fluent that UDF (sinusoidal profile of pressure) has been used at the pressure outlet of the domain. Is it necessary...

10 November 2019 5,356 4 View

Why the solution of a transient flow problem reaching steady state after the flow has evolved in Fluent??

I am simulating a transient supersonic flow in CD nozzle. After the flow has evolved, the solution is reaching steady-state. What might be the reason the reason for it? It seems that with each...

04 May 2019 7,366 17 View

What should be the gauge pressure in pressure outlet bondary condition with Subsonic and Supersonic flow at the pressure outlet?

It is known that the solver only takes the value of gauge pressure only when the flow is subsonic. So what should be the value for gauge pressure?? Should it be ambient pressure?

11 December 2018 4,823 0 View

Why my result is diverging when the low mach number flow is reaching the pressure outlet??

I am doing transient simulation of compressible flow over forward facing step. The pressure ratio maintained is 5.5 bar. Whether it is k-epsilon or k-omega it is diverging only when the low mach...

10 November 2018 2,877 10 View

Does the pressure(-600 mmHg) affects pH?

When I conducted the degassing experiment using decompression under anaerobic condition(and I used ferrous based chelating agent), the oxidized ferric were observerd. So, could you tell me the...

03 March 2021 4,892 5 View

Why can't make aluminum nitride film successfully by use sputter?

We use reactive sputtering process to make aluminum nitride film, and want to make c-axis aluminum nitride film on a silicon substrate, but the crystal orientation cannot be seen with...

03 March 2021 7,975 3 View

Is there any test to determine the cardiovascular risk of patients with obesity? from the perspective of obesity?

We found tests to determine cardiovascular risk taking into account lipid profile, blood pressure, age, history of diabetes, other laboratories. But when weight is involved, there is a paradox. I...

02 March 2021 6,036 1 View

What are the most reliable approaches to extract key continuous frames from a video, with complete automation?

I have an input video, of skin (from a microscope that means it is magnified such that blood capillaries are visible). The idea is to extract 15 sec of continuous frames from a video of 1 min,...

02 March 2021 2,735 2 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

Sutter electrode holder leaking after applying positive pressure. How to fix?

I am using a Sutter electrode holder for my patch clamp experiments, but I'm having trouble keeping positive pressure inside my electrode due to a leak out of the back of the holder. I have added...

02 March 2021 5,829 1 View

What SPSS analysis should I run with one IV (with two levels) and two DVs?

Hi, I am trying to figure out which test would be most appropriate to run for the following question: Is there a difference in task blood pressure between smokers and non-smokers? There are two...

01 March 2021 8,235 2 View

How much pressure we can reduce at the outlet to avoid Reverse Flow?

I am simulating Heat Exchanger. I have tried and tested all the methods to resolve this issue from the internet like refining mesh, improving skewness and orthogonal quality ,extending outlet to...

01 March 2021 6,985 3 View

How to show arrows over the streamlines in CFD-post?

I follow this to make streamlines like the photos attached below: (software- CFD post-processing) First I plot the 2D streamline over a surface "streamline 1". them I plot a vector by the...

01 March 2021 8,668 3 View