Tips & Tricks

Modeling the solidification of cast irons

Successfully modeling solidification of Cast Iron is of great help for the foundries to reduce their production costs and thus to increase their profits. If the basic physical solidification phenomena are correctly modeled by the simulation tools mold risering can really be optimized.

Why it is useful to describe problems in terms of non-dimensional parameters and which ones are the main important in solidification?

A dimensionless quantity is a quantity without any physical units. Such a number is typically defi ned as a product or ratio of quantities which do have units, in such a way that all units cancel. Dimensionless quantities are widely used in the fields of physics and engineering but also in every day life.

Working with Solids in CFD-GEOM - Part 1: Boolean Operations

Given that today’s users may import several complex parts into CFD-GEOM, this tip will demonstrate how to use the Solid Boolean Union Option to combine several parts into one.

Make an independent setup from existing pre and rst files in PAM-STAMP

Sometimes only rst files there are available and dependent pre file of an intermediate stage setup (lost data, picking with a process variant, …), which is not possible to run in another PAM-STAMP version, usually in newer version. It is possible to create a pre file independent on preceding rst files.

Determination of Krupkowsky parameters for hardening curve

In case there are no measured material data for simulation purposes, it is possible to determine hardening curve from information usually provided by material supplier.

Influences of Solidification Length and Pressure Intensification on Gas Shrinkage Microporosity in Casting Components

Porosity in castings is a major defect since it affects the mechanical properties. In particular porosities are sites for the initiation of fatigue cracks. Therefore, the reduction of porosity fraction and size, the control of porosity distribution and morphology are crucial for the optimization of mechanical resistance of as cast components.

Grouping parts during data import in CFD-VisCART

When dealing with complex industrial models such as cars and airplanes, hundreds of parts need to be managed. Each one of these parts may also be subdivided into different components. In order to easily manipulate these different parts and components in CFD-VisCART, you can make use of the grouping feature.

How to import a PAM-STAMP result into CATIA V5 with VRML export format ?

For a comparison of the virtual stamped part and the nominal CATIA V5 part one can use PAM-STAMP, or go back to CATIA. Since the meshed part is not easily converted into surfaces again, one solution is to use an overlay of the CAD part and of a VRML export of the stamp part.

How to encrypt material data sets in PAM-STAMP?

Major automotive companies spend a lot of money to describe all materials used in their simulation processes. To ensure simulation quality also at supplier sites, they want to give the material data sets to them, but not for free. One half of the solution is material encryption, the other a predefined expiration date.

Boundary layer meshing with CFD-ACE+ [video format]

The accuracy of a CFD solution is strongly dependent on how well the mesh resolves geometry and flow features. This is especially true for near wall regions (boundary layer) where viscous forces are not negligible compared to inertial forces.