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--- en:rex3d:rex3dpreprocessing [2024/05/24 13:21] – angelegt admin
+++ en:rex3d:rex3dpreprocessing [2026/09/01 12:40] (aktuell) – [Starting a REX3D Simulation] admin
@@ Zeile 1: / Zeile 1: @@
-====== REX3D Pre-Processing======
+======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]]