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Questions related to CFD Simulation
Dear all, Is this true: If sum of two contour maps (say map A and map B) of the same physical quantity remains constant (say C) at every point of the field, then a contour line labeled m in A...
09 September 2019 5,043 3 View
how to use steady state solution as initial solution for les ? the problem is that Rans model produce average velocity field while les need instentenous velocity field,so it there a way to solve...
23 August 2019 5,721 5 View
I am doing a CFD study on a baseball falling into a water tank. I am using overset mesh but I am not sure what physics model to use to simulate the water tank. I am also confused about what...
06 June 2019 9,148 1 View
I am about to visit wind tunnel facilities to test an automotive vehicle. The speed at which the CFD analysis are being carried out is 17 m/s To avoid the blockage effect a scaled model will be...
05 June 2019 7,496 3 View
Hi! I am working on the design of liquid cooling BTMS for a electric racing car. When I simulate the thermal behavior of the cooling plate.The streamline always show half of what it should be.It...
20 May 2019 555 2 View
Hello, I constantly submit parallel jobs in a shared HPC cluster for my OpenFOAM flow simulations and like everyone else, I have to decide how many cores I need. Our cluster runs constantly over...
12 May 2019 8,582 6 View
Dear community, I am interested in modeling capillary forces in porous media using the VOF model. The reason for using VOF is mere because of stability. Eulerian-Eulerian is too sensible to IC...
01 May 2019 1,799 2 View
I am simulating an airfoil under the effect of sinusoidal gust having the following profile (Vg=kg*sin(omega*t)) and at the same time i am pitching the airfoil using a circular domain around the...
15 April 2019 5,814 12 View
when using Ansys to find the stall angle of a wing once the wing stalls the lift increases again, does anyone know why this is? I did an experiment on the same wing in a wind tunnel and the same...
04 April 2019 2,431 3 View
I have a geometry where the flow is transitional. i.e. a part of it has laminar flow and rest part has turbulent flow. Can I use k-epsilon model for this problem? Does it resolve the laminar...
29 March 2019 6,712 19 View
I am interested in the numerical characterisation (3D-CFD) of aerodynamics and flow-induced noise (near-field) generated during the operation of a standalone horizontal axis wind turbine. Since I...
14 March 2019 3,499 3 View
2D Airfoil is used for CFD simulation with its domain having a C shape in which the curve edge is the velocity inlet. If I set the boundary condition for the inlet to magnitude and direction,...
14 March 2019 7,998 3 View
Hello and good day, current I'm having problem to proceed with the meshing and then the error message of " The mesher did not generate any nodes. All geometry may have been defeatured away" is...
08 March 2019 8,388 3 View
The relaxation factor can speed up the calculation. In a passive air cooling simulation of the battery pack, I used the default parameter value (0.99) afforded by STAR-CCM+, but the temperature...
25 February 2019 768 9 View
The system of potential equations in batteries is elliptic with Neumann boundary conditions ( constant current density condition ). To solve this system, we must force each node of the grid to...
17 December 2018 9,544 2 View
Most of the CFD solvers use FVM. However, FDM is pretty simple to implement. I am interested to know exactly what advantages do FVM offer. And when should one go for FDM if he is planning to write...
14 December 2018 8,972 38 View
I am simulating boiling flow with CFX. I want to make mesh sensivitiy study. The problem is that for coarse mesh the solution is converginig. As I do finer mesh I am getting trouble. It is not...
29 November 2018 4,088 8 View
Is it possible to use wall functions in CFD simulation of flow around a cylinder or an airfoil when the objective is to find aerodynamic forces, vortex shedding behind and also separation point or...
24 November 2018 8,403 3 View
Hey fellows! I would like to simulate a pressurised outlet stream of air. In the simulation I'll have some kind of a container filled with an overpressure of 2 bar air and I would like to...
24 October 2018 812 2 View
There is a micro Kaplan hydro plant: Flow rate: 0.58 mc/s Head: 4.85 m RPM: 625 Max electrical power: 16.5 kW Generator+gearbox efficiency: 0.89 Maximum Turbine efficiency: 0.67 Draft tube:...
17 October 2018 7,344 3 View
Hello, Im trying to simulate a U-shaped thermosyphon with an outer copper casing. In short I have done the following. 1. Three part geometry, of outer copper tube, inner water and air. The...
17 October 2018 682 3 View
I need to design a simulation, where model is stationary and the mesh is moving. Please share any tutorials and ideas Thank you
20 April 2018 7,762 2 View
Need it for simulation purposes.
02 April 2018 6,786 2 View
I am working on VOF, i am simply doing it for isolated bubble rise in air water system.its 2D simulation I want to know How to determine dia and terminal velocity of bubble?
23 March 2018 6,593 8 View