Farzad Farajidizaji

9 Questions 22 Answers 0 Followers

Questions related from Farzad Farajidizaji

How to get "density" and "viscosity" for cavitation(water vapor) for cavitating Francis turbine?

Hello there I am simulating cavitation for a Francis turbine. Francis turbine is rotating with 826 rpm. I have two questions; 1- Vapor pressure for my case is 2100 Pascal, and Temperature is 25...

14 May 2024 4,261 7 View

What are the boundary conditions for a 2D Channel when we know pressure inlet?

Hello everyone I am working in a 2D channel where I know the inlet Pressure as a function of cosine, and out let pressure at atmospheric level. What should I use for inlet and outlet boundary...

27 November 2023 6,376 5 View

Can I use convergence behavior of residuals to predict if my flow is laminar or turbulent when I use steady state simulation?

Hello all, I am trying to predict Drag coefficient of an object(and I am not interested in the vortex shedding after my object, also I cant afford LES), so I decided to use steady state...

06 April 2023 1,327 0 View

laminar Flow over a sphere(laminar vs KOmegaSST simulation) in OpenFoam?

Hello all I am simulating flow over a sphere at Re = 881 where Drag coefficient must be almost Cd=0.5. I simulate it using both using laminar and Turbulent models(KOmegaSST). for laminar...

12 March 2023 9,297 3 View

How to calculate energy spectrum for a Homogenous Isotropic turbulence at specific time in a rectangular shape?

Hello all I have two questions; 1- First of all, is it possible to generate HIT inside a rectangle? If so, it is called HIT again? 2- if Nx=Nz but Ny is different, How can I calculate power...

13 January 2023 3,085 3 View

How to use Linear forcing for generating HIT(Homogeneous Isotropic Turbulence)?

Hello everyone I have read Lundgren(2002) article "Linearly forced isotropic turbulence" which by adding a linear forcing to momentum equation, he was able to get forced isotropic turbulence. I...

09 January 2023 4,507 2 View

What is the integration upper limit for calculating Integral length scale based on auto-correlation?

Hello everyone I have attached the integral length scale definition where upper limit goes up to infinity, but in some references practically they integrate from 1 to where autocorrelation...

15 December 2022 3,855 1 View

What happens if I use RANS model(eg KEpsilon) on a laminar artery flow which is slightly transition to turbulent fow OR just stay laminar?

The artery geometry has an irregular shape where there is possibility of transitioning from laminar to turbulent for most cases in the stenoid(narrow) region , but for some of arteries flow...

05 October 2022 3,851 9 View

How momentum distribute in DPMFoam or MPPICFoam?

Dear Friends I am simulating a rectangular bubble column(using MPPICFoam) and I want to refine the mesh as small as possible in Y-direction. One thing in unknown to me; How momentum distribute in...

13 May 2020 6,113 0 View