SimScale Releases Up to 96-Core Instances and New Meshing Algorithm

BlogAbout SimScaleSimScale Releases Up to 96-Core Instances and New Meshing Algorithm

With the latest updates on SimScale, we have released some exciting new features. Up to 96-core instances for customers, a sneak preview of the new highly automated hex-dominant meshing and Parasolid-based tessellation for high-quality CFD meshes are among the highlights.

Up to 96-Core Instances for SimScale Customers

Until now, SimScale users could only use up to 32-core machines. With the new release, we have added 64- and 96-core instances for SimScale customers. Those instances can have a huge impact, mainly for:

wind loads on buildings in New York CFD analysis
Wind load analysis in New York carried out with the cloud-based SimScale platform
Meshing times for a 10-million cell mesh used for the aerodynamics simulation of a building in urban architecture. The decreased speed for the highest instances at this mesh size is mainly due to the reconstructing process for the parallel results. 96-core machines
Meshing times for a 10-million cell mesh used for the aerodynamics simulation of a building in urban architecture. The decreased speed for the highest instances at this mesh size is mainly due to the reconstructing process for the parallel results.
Simulation Times for the Aerodynamics Analysis of a City Building with a 10 Million Cells Mesh
Simulation times for the aerodynamics analysis of a city building with a 10-million cell mesh

Hex-Dominant Preview

The beta phase of the new hex-dominant meshing algorithm has started. The main focus for the development of this algorithm is to create quality meshes in a highly automated way, and also to make manual mesh tweaking an increasingly edge-case scenario. Therefore, the sizing of the mesh is mainly based on the geometrical properties of the CAD model. The algorithm is enabled for all SimScale users. You can contribute to the further development of this feature by adding your feedback in our forum thread.

hex-dominant mesh of printed circuit board
Automatic hex-dominant mesh of a printed circuit board created with SimScale

Improved STL Generation

As the first feature based on the recent integration of Parasolid, we adapted our tessellation algorithm to provide high-quality and fully automatic faceted models. These are required as input for the hex-dominant meshing algorithms. A quality resolution of detailed CAD features and curvatures is key to simulation robustness and accuracy. For example, consider multiphase simulations of a ship hull or turbine blade design studies.

Tessellation of a ship hull with the fully automatic Parasolid-based tessellation algorithm
Tessellation of a ship hull with the fully automatic, Parasolid-based tessellation algorithm

Thermal Interface Resistance in Conjugate Heat Transfer

Heat transfer between solids is, in real case scenarios, imperfect due to surface roughness on the contact region. To improve the heat transfer, a very thin layer of a thermal interface material (TIM) is added in between the solids. It is possible to directly define the thermal contact resistance or even add a thermal interface material without the need to explicitly model this in the CAD.

Momentum, Power and Passive Scalar Sources for Convective and Conjugate Heat Transfer

Momentum sources were added as a new feature in CFD. They are very helpful when modeling components like jet fans in parking garages or fans in thermal packaging applications. In contrast to the complexity of modeling the fan geometry and rotational domain, in many cases, it is sufficient to model the momentum introduced by those components. For example, in the easiest case, this can be achieved via a simple geometry primitive like a cylinder. We also extended previous concepts of the incompressible solver like power sources and passive scalar sources to the convective and conjugate heat transfer applications.

garage ventilation without and with fans
Velocity profiles in an underground parking garage without (left) and with (right) jet fans

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