Use of artificial intelligence and machine algorithims to revolutionize the field of fluid dynamics?

Hello Everyone ! I have been having this question in mind for quite a long time that we have this huge amount of data available in the form of wind tunnel experiments , in-flight data and...

31 December 2019 2,047 8 View

What is the size of laminar-turbulent transitional regime in terms of spatial and temporal dimensions ?

Hello Everyone , I was wondering is there any literature available on the extent of transitional regime in space and that for how long does it last ? Regards Aamir Sultan

31 December 2019 1,245 3 View

What happen with the conservation laws when we locally refine grids in adaptive meshes?

Does continuity , momentum and energy laws remain conserved when we use local refinement in adaptive meshes ?

31 December 2019 4,007 4 View

Why pressure far-field require a domain as far as 20 times of the characteristic length ?

Hello Everyone , Pressure far-field boundary condition is often recommended for flows with varying density , but why does it require so larger outer domains. Regards Aamir Sultan

31 December 2019 3,084 3 View

Why does Spalart Allmaras turbulence model underpredicts the Separation of Flow ?

Hello Everyone ! It is alway said that SA model is apporopriate for adverse pressure gradients then how come it lacks the ability to accurately predict separation ?

11 December 2019 354 2 View

Is Spalart Allmaras turbulence model capable of simulating Laminar Separtion Bubbles ?

Hello Everyone I am simulating an airfoil at Low Reynolds Number flow Regime Re=10^5 , in this particular case a laminar boundary layer separates , forming a laminar separation bubble , then...

11 December 2019 3,727 3 View

Which length is used as the reference length while doing external aerodynamic CFD simulation of a full aircraft ?

Hello Everyone , Hope you are doing fine . I have this question about the reference values , that which length should one use while doing external aerodynamic CFD simulation of a full aircraft...

10 November 2019 5,185 4 View

Ineffectiveness of Spalart-Allmaras model on a flat plate wing at Low Re No of 10e5 as the aspect ratio of wing increases ?

Hello Everyone , Hope you are doing fine . I was going through this paper of P. Cosyn and J. Vierendeels on ''Numerical Investigation of Low-Aspect-Ratio Wings at Low Reynolds Numbers'' in which...

08 September 2019 1,461 2 View

For a Mach No of 0.02 pressure based solver is diverging?

Hello Everyone , I am doing a 3D simulation of a 3D wing at a Reynold's number of 10^5 and a mach number of 0.02 . When I use pressure based solver my solution diverges within few iterations ....

02 March 2019 5,366 2 View

Udf to rotate a 3D wing to a certain roll angle for a specified period of time ?

Hello Everyone , Hope you are doing well. I have to rotate a 3D wing at different roll angles with the help of udf in Ansys fluent. Can someone provide me literature regarding this . Regards...

01 February 2019 6,374 2 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View