Armin Hajighasem Kashani

12 Questions 7 Answers 0 Followers

Questions related from Armin Hajighasem Kashani

Appropriate timestep size to resolve vortex shedding from a rectangular bluff body?

I'm doing a 2D transient simulation of turbulent flow past a sharp-edged rectangular bluff body. I'm using a version of k-omega model for turbulence modeling. My objective is the time-averaged...

28 January 2023 1,063 3 View

What are the best practices for simulation of the flow past a semi-submerged rectangular cylinder?

Hi all, I am going to use either Ansys CFX or Ansys Fluent solver to simulate flow past a semi-submerged rectangular cylinder, as shown in Fig. 1. The main goal here is to achieve an accurate...

05 October 2022 9,850 4 View

How to approach CFD simulation results of a flow past a cylinder?

Hi all, I'm doing a transient simulation of flow past a rectangular cylinder close to the free surface. As far as I'm concerned, the common practice is to discard the initial stages of the...

26 February 2021 1,563 3 View

How to calculate time-averaged fields from Ansys CFX solver?

I would appreciate any comments on the following problem. I need to calculate mean fields (e.g. pressure, velocity and vorticity), for which I activate Trn Stats tab in CFX-Pre. However, what I...

22 February 2021 9,203 7 View

The most suitable turbulent models to predict flow past a floating body?

Hi all, I'm planning to simulate flow past a floating body using CFD method with the main purpose of investigating its stability against hydrodynamic forces. A sketch of the problem is presented...

29 January 2021 6,046 5 View

How to measure the equivalent sand-grain roughness of a sandpaper?

I want to use standard sandpapers of different grit sizes to impart flow resistance to a surface. I am wondering how to convert the roughness of sandpaper to an equivalent sand-grain roughness. Is...

19 October 2020 9,628 3 View

Can accelerometers be used to measure fluid flow forces and torques acting on an immersed 3D object?

I am conducting an experimental study in the hydraulic lab. I need to measure the real-time forces and torques that a fluid exerts on a 3D object freely moving in the flow field. Is it possible to...

26 June 2020 8,324 0 View

Why does a turbulent flow form eddies?

I can't understand from a physical standpoint how fluctuating velocity components in a turbulent flow lead to formation of spinning structures of different sizes known as eddies. Can anyone...

20 June 2020 725 68 View

How to examine the stability of an airfoil?

In the problem of my interest, an airfoil is subjected to fluctuating flow forces associated with vortex shedding. The objective is to examine airfoil stability. In the literature, I saw drag and...

19 May 2020 5,452 1 View

How to characterize fluid forces induced by vortex shedding phenomenon?

As shown in the figure attached, the turbulent fluid flow around a floating (i.e. partially submerged) cylinder with a rectangular cross-section is to be modelled. Clearly, the forces and torques...

10 May 2020 9,461 2 View

What are the pros and cons of basing the simulation of an incompressible flow problem on the stream function-vorticity formulation?

I'm trying to develop a code to solve the stream function-vorticity equations using the Finite Element Method in order to simulate a 2D incompressible flow problem. I was wondering what the pros...

20 March 2020 4,224 6 View

What is the distinction between PIV and LSPIV?

Particle Image Velocimetry, or PIV, is a technique for flow visualization and velocity measurement. Also frequently encountered in the literature is 'Large-Scale Particle Image Velocimetry', or...

24 August 2019 8,140 8 View