Tips About DPM To simulate the evaporation process of droplets, we need to define the thermophysical properties of Material accurately. Saturation vapor pressure, Binary diffusivity, latent heat, boiling point, and specific heat should be considered. These parameters are accessible in…
DPM: Post-Processing In most DPM spraying simulations, the behavior and changes of particles during the motion and effects of continuous phase on them are our field of interest. In some cases, the continuous phase could be important as well. Fortunately,…
Drag Law Part 2 high-Mach-number Drag Law Model This model uses the same drag force defined as the spherical model (Drag Law Part 1), but a correction factor is added. This model is used for Mach number of particles greater…
Drag Law Part1 There are some assumptions in the DPM model: The model is simulated by solving transport equations for the continuous phase and discrete second phase in a Lagrangian frame of reference. *notice* it’s not necessary to solve the…
DPM Overview Lagrangian particle tracking (DPM) is an available model in Ansys Fluent. This works based on the force balance on the particle and the heat and mass transfer from the particle in the local continuous phase. Ansys Fluent can…
Pressure Swirl Atomizer Another essential type of atomizer is the Pressure Swirl Atomizer, one of the most important injectors for spraying liquids, especially in propulsion systems. This atomizer is also known in the gas turbine as the Simplex Atomizer. This…
Atomizer Models ANSYS FLUENT also offers more sophisticated injection types for sprays that describe breakup phenomena. For most types of injections, you must provide the particles' initial diameter, position, and velocity. However, there are models for predicting droplet size and…
Plain-orifice, the most common type of Pressure Atomizer and the most straightforward type ever made. However, there is nothing simple about internal nozzle flow and external atomization physics. In the simple Atomizer at ANSYS FLUENT, the liquid accelerates through a…
Limitations of using Discrete Phase Model The Discrete Phase Model (DPM) is a method that could simulate the motion of particles in the computational domain. However, several limitations exist when using this model that must be paid attention to to…
Tips on Solid-cone injection In this article, tips on solid-cone injection has been investigated. In addition to simple injections, ANSYS FLUENT offers more complex sprays injections that describe the initial break-up phenomena. For most injections, you must provide the particles'…
DPM Injection and Particle Types Discrete Phase Model In numerical and theoretical studies of multiphase flows, you can writhe the governing equations of the flow separately for each phase. Two approaches can be used to study the motion of each…
DPM Injection Cone / Solid Cone Hollow Cone Vs. Solid Cone This type of DPM injection is defined for three-dimensional problems, where Solid Cone is used for solid cone nozzles, and Hollow Cone is used for hollow cone nozzles. Inputs…
Direct Injection Type Setup Single Particle flow injected from a point is also shown in the figure below. Group Particle flows that are injected in groups and are shown as follows: As you can see, we first marked the two…
Particle Type This section defines the particle type and the physical models related to each particle. To access the window related to this section, we do the following: Models>>discrete phase>>injection>>create>>particle type The type of particles is given in the following…
Diameter Distribution In Ansys Fluent software, there are three types of diameter distributions that show how the particle diameter is injected from the injection site, which are: Linear Diameter Distribution First, we determine the diameter of the starting and ending…
Introduction In CFD simulation, the governing equations are discretized and rewritten, either at a point, an element, or a control volume called a cell or element. To reach an exact CFD solution, the Analyst Engineer must divide the domain into…
Physical Models Discrete Phase Model In the Physical Models part, three options need to be activated: DPM: Stochastic Collision & Coalescence: Fluent provides an alternative in simulations that tracking droplets are vital to estimating particles' collisions. The more particle collision,…
DPM Spray This section presents the first step of the DPM/Spray modeling procedure. First, select the Discrete phase in the Models tab of Ansys Fluent software; so the general settings can be set in the appeared window(Figure 1). It…
DPM CFD Simulation (1-way Vs. 2-way Vs. 4-way) The coupling of the discrete and continuous phases can be modeled. Low volume fractions should be set for the Discrete Phase. One-way coupling DPM Only continuous phase flow affect the dispersed…
Discrete Phase Model Assumptions There are some assumptions in DPM model: The model is simulated by solving transport equations for the continuous phase and discrete second phase in a Lagrangian frame of reference. *notice* it's not necessary to solve the…
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