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Kontaktieren Sie den Administrator, wenn Sie glauben, dass hier ein Fehler vorliegt. ======Pre-Processing====== ===== Preparing a REX3D Simulation===== Before a flow simulation can be performed, it must be configured as follows:\\ * **Option 1**: Menu: //Simulation// > //Open REX3D Configuration//\\ * **Option 2**: Double-click //REX3D// in the process tree\\ \\ {{ :rex3d:rex171_3d_en006.png?nolink |}} \\ In the window that appears, select whether the simulation should be assigned to an existing process or whether no process assignment should be made. {{ :rex3d:rex171_3d_en_007.png?nolink |}} The following window then opens:\\ {{ :en:rex3d:rex19_openfoam_prepro_en.png?nolink |}} ====Defining the REX3D Configuration==== \\ The REX3D preprocessing dialog is used to define the screw configuration, material, simulation settings, and process parameters for the numerical flow simulation.\\ The upper section of the dialog displays the //Configuration Name//, the associated //Process Name//, and optionally a //Comment//.\\ ====Defining the Geometry==== The //Screw Configuration// section lists the screw zones as well as the shear and mixing elements contained in the process in their respective order.\\ Selecting an entry displays the corresponding data in the lower section of the dialog.\\ \\ A //Predecessor// and a //Successor// can be taken into account for the selected element.\\ \\ A //Gap// must be defined between the selected element and the respective neighboring element.\\ \\ In addition, the geometric parameters of the selected element are displayed. ====Material==== The material used for the simulation is displayed under //Material//. The corresponding material data can be accessed via the material entry.\\ ====Simulation Settings==== The //Simulation Settings// section contains the basic settings for the numerical calculation.\\ \\ //OpenFOAM// and //FeatFlow// are available as //Solver// options.\\ \\ Two options are available for the geometry:\\ * //Generate Geometry// * //Geometry File// \\ When //Generate Geometry// is selected, the geometry required for the simulation is generated from the defined screw configuration. Alternatively, an existing geometry can be selected using //Geometry File//.\\ \\ The //Viscosity Limits// define the viscosity range taken into account during the calculation.\\ \\ The //Mesh Quality// determines the spatial resolution of the computational mesh. You can choose between //coarse//, //medium//, and //fine//. A higher mesh quality results in a finer computational mesh, but also increases the computational and memory requirements.\\ \\ The //Isothermal Simulation// option can be used to perform a calculation with a constant material temperature. If this option is not activated, the temperature development of the melt is taken into account in the thermal calculation.\\ \\ With //Automatic Post-Processing//, an automatic evaluation of the calculation results can be started directly after the simulation has been completed. ====Defining the Process Parameters==== The //Process Parameters// section is used to define the operating conditions for the simulation.\\ \\ For the flow simulation, either the //Throughput// or the //Pressure// can be specified.\\ \\ The //Material Temperature// describes the temperature of the polymer melt at the inlet of the simulation domain under consideration.\\ ====Thermal Boundary Conditions==== For the thermal simulation, the barrel and screw temperatures can either be specified or defined as //adiabatic//.\\ \\ If //adiabatic// is deactivated, heat transfer can take place between the barrel and the polymer melt.\\ ====Importing and Exporting the Configuration==== The //Import Configuration// button can be used to load settings from a previously saved REX3D configuration.\\ \\ The //Export Configuration// button can be used to save the current configuration for later use.\\ \\ Click //OK// to apply the settings. Click //Cancel// to close the dialog without applying the changes. Click //Help// to open the corresponding help page for the dialog.\\ =====Starting a REX3D Simulation===== To start the simulation, expand the REX3D section under the project data. This section displays all created Extrud3D configurations assigned to the respective process.\\ Double-click the name of a configuration to open it:\\ * Set the number of CPU cores to be used. At least 3 CPU cores must be available for the simulation.\\ * The simulation can then be started using the //Start REX3D Simulation// button. The //i// button displays the required hardware specifications.\\ \\ {{ :en:rex3d:rex19_openfoam_simulation_en.png?nolink |}} \\ First, a three-dimensional finite-element mesh generator (gmsh) generates the geometry based on the previously defined input data and displays the result in a preview window.\\ \\ {{ :en:rex3d:rex171_3d_en_005.png?nolink |}} \\ The element can be moved and rotated in three-dimensional space using the mouse. The //Top View// and //Front View// buttons provide predefined viewing angles of the generated element.\\ If the generated mesh meets the requirements, click the //OK// button to start the simulation.\\ \\ ===Further Topics=== * [[en:rex3d:rex3dpreprocessing|]] * [[en:Rex3d:Rex3dPostProcessing]] * [[en:Rex3d:Rex3dKonfiguration]] * [[en:Rex3d:openfoamremote]]