when fuel is sprayed in engine, jet primary and secondary breakup happen and tiny droplets are formed. The performance of fuel spray in engine depends on the size of these droplets.
The major two phase flow regime in the micro tubes is the Slug flow regime. In this case there is one or few bubbles inside the channel. Hence, it is usually using surface tracking techniques for simulation of two-phase flow in micro tubes.
For numerical simulation of wave body interaction several solver is developed in OpenFOAM such as:
- olaFoam (or olaFlow)
Those solvers are developed based on OpenFOAM solver interFoam which is a VoF solver. In this post, i will discuss about olaFoam
OpenFOAM has several heat transfer solvers such as:
- buoyantBoussinesqPimpleFoam, buoyantBoussinesqSimpleFoam
- buoyantPimpleFoam, buoyantSimpleFoam
- chtMultiRegionFoam, chtMultiRegionSimpleFoam
In this post, i presented my simulation of free surface over cylindrical spillway using OpenFOAM solver (interFoam).
following steps are conducted for preparing case:
Many different phenomena in industry or nature include a deformable interface for example the water falling from a spillway. The simulation of such events is essential to better understanding of two-phase flow behavior, in order to optimize the design or to calculate hydrodynamic coefficients. The precise and correct modeling of interface is the key parameter in simulation of free surface. There are different interface tracking methods such as VoF (volume of fluid), LS (level set) and FT (front tracking). Each method has its own advantages and disadvantages, however VoF is becoming the most common interface tracking method due to it’s ease of implementation and mass conservation. OpenFOAM VoF solver is interFoam. The solver uses a technique called MULES to compress the interface and return the sharp interface. The interFoam is suitable for two-phase isothermal incompressible system. The derived solvers form interFoam is:
As a part of my Ph.D thesis, i extended an OpenFOAM solver interFoam to consider mass transfer due to boiling and condensation, new solver is called phaseChangeHeatFoam. It is available in git,now. It can be download and compiled with following commands in Linux terminal.
git clone https://github.com/NimaSam/phaseChangeHeatFoam/ cd phaseChangeHeatFoam/Application/ chmod +x All* ./Allwmake
The zip file can be download from here.
I wrote the first edition of OpenFOAM book around 5 years ago in Persian. The book was based on OpenFOAM-1.6. The aim of that book was to shorten the process of OpenFOAM learning. It was 5 chapters that included some simple and introductory examples. It covered different parts of OpenFOAM utilities, solvers and programming.