
polyflowug  Film Casting
The steps for defining a film mo del are listed b elow: 1. Define a subtask for the film model. Create a subtask (a) Select the appropriate problem type. Film mo del: Gen. Newtonian isothermal Film mo del: Gen. Newtonian nonisothermal Fi...
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polyflowug  Blow Molding and Thermoforming
In order to compute the residual stresses and deformations, there are several steps: 1. The first step is to simulate the blow molding, thermoforming, or extrusion. This first step may or may not be isothermal. 2. The second step is only re...
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polyflowug  Remeshing
16.1.3 Choosing a Remeshing Technique Each of the remeshing techniques available in POLYFLOW is designed to work well for a certain class of problem. Recommendations for the use of the remeshing techniques are listed below: The method of sp...
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polyflowug  Remeshing
16.1.3 Choosing a Remeshing Technique Each of the remeshing techniques available in POLYFLOW is designed to work well for a certain class of problem. Recommendations for the use of the remeshing techniques are listed below: The method of sp...
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polyflowug  Free Surfaces and Extrusion
Geometrical Degree of Freedom In order to be wellposed, a freesurface problem requires a new scalar degree of freedom, called the geometrical degree of freedom. The geometrical degree of freedom is denoted by h, which describes the amplit...
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polyflowug  Porous Media
14.1 Introduction In POLYFLOW, the Darcy model is used to calculate flows involving porous media, such as the flow of oil in sand, or of a polymer through a mat. Subtasks of the Darcy type are available in 2D and 3D, in steadystate and ti...
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polyflowug  Heat Transfer
(a) Select the boundary for which you want to set thermal conditions. (b) Click Modify. (c) Select the boundary condition type you want to impose. For each external boundary, there are four possible conditions for a heat conduction problem,...
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polyflowug  Flow Induced Crystallization (FIC)
An understanding of the following features of the mo del may help a few to obtain the b est p ossible results from this mo del, without unrealistic exp ectations. This model ([8]) is new, and may be improved in the future. Some alterations...
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polyflowug  Viscoelastic Flows
Proper selection of a differential viscoelastic model is certainly one of the most important and difficult aspects of the simulation of a viscoelastic flow. In order to make an educated choice, you should collect as much data about the flui...
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polyflowug  Generalized Newtonian Flow
For 3D flows, the default representation is the minielement developed by Fortin [9]. The minielement is implemented as a correction to the linear element: a degree of freedom is introduced on the midfaces of the elements, but only for th...
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polyflowug  Material Properties
A PMAT dependence can also be applied to density to model a compressible flow. For such flows with variable overall density, POLYFLOW does not solve for the volume but rather solves the mass conservation equation. The overall density is eit...
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polyflowug  Boundary Conditions
8.2 Interface Condition The interface condition establishes the continuity b etween the two sides of an intersection b etween different subtasks. For the momentum equation, the interface condition guarantees continuity of the velo city fie...
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polyflowug  Meshes
Setup Time Many flow problems solved in engineering practice involve complex geometries. The creation of structured or blo ckstructured meshes (consisting of quadrilateral or hexahedral elements) for such problems can b e extremely timeco...
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polyflowug  Unit Systems
By default, POLYDATA (as well as POLYFLOW) ignores the system of units that you are using. Hence, by default, all values must be specified in accordance with your system of units, and the numerical values will be interpreted accordingly. In...
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polyflowug  Reading and Writing Files
A data file consists of two parts. The first part contains the data that you specified through POLYDATA during the problem definition (including default settings that you did not modify). When you read a data file into POLYDATA, only the in...
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polyflowug  Sample Session
1. Enter Sample for the Project name and click OK. POLYMAN creates the project and displays it in the list tree (see Figure 4.3.2), showing two branches: Geometry and Simulations. It creates a directory called Sample and a file called Sampl...
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polyflowug  Managing POLYFLOW Projects Using POLYMAN
The menu bar contains five pulldown menus: File contains menu items for creating new projects and simulations, opening existing projects, importing and exporting files, and exiting POLYMAN. See Sections 3.3, 3.4, 3.5, 3.6, and 3.15 for det...
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polyflowug  POLYDATA Graphical User Interface
Under the Menu bar, there is a series of ten keywords: REFR refreshes the display of the POLYDATA menu. STOP stops POLYDATA without saving the current session to a file. SAVE saves the current session to a session file without generating a...
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polyflowug  Getting Started
1.3.1 Planning Your POLYFLOW Analysis When you are planning to solve a problem using POLYFLOW, you should first give consideration to the following issues: Definition of the modeling goals: What specific results are required from the CFD mo...
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polyflowstat  POLYSTAT 3.11 User's Guide
There are various ways to define the process of mixing. Dankwertz in the 50ies analysed the mixing as an homogeneisation process of a concentration field; initially two different fluids are separated in two adjacent zones; as the time goes...
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polyflowstat  Polystat User's Guide THE POLYSTAT USER'S M
The major steps are the following : 1) in the menu FILE, we read the results generated by Polyflow (the data necessary to Polystat). 2) in the menu PROPERTIES, we can ask the program to calculate new parameters evolving along the trajectori...
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polyflowstat  Polystat User's Guide MIXING TASK IN POLYDA
The first three options define the flow where material points will travel : we need to know the flow domain (not necessarily the complete domain defined by the mesh), the type of boundaries of this domain (there are several kinds of possibl...
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polyflowstat  Polystat User's Guide THE MIXING THEORY
For a given pair of polymers, a critical Capillary number may be found. It corresponds to the situation where the viscous stress competes with the interfacial stress: the drop is extended and finally breaks up into smaller droplets. We name...
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polyflowstat  Polystat User's Guide INTRODUCTION
In industry the mixing process is widely present; it occurs in different kind of machines, in a continuous or batch process, like in Banburry mixers, Kenics mixers, extruders, stirred vessels, and so on. The objectives are various too : dis...
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polyflowstat  ADDENDUM A. THE SIMULATION OF THE DISTRIBU
Lets suppose the flow to be 3D, steady state, in a closed domain. To perform the analysis of the distribution, the following steps are necessary. 1) We calculate the flow (velocity and pressure) . 2) We calculate in the mixing task 1 the re...
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