While each general flow CFD problem is unique, CONVERGE CFD software has a plethora of powerful and flexible features to help you obtain accurate and efficient results for a vast array of general flow problems. From refining dirty CAD geometries to post-processing simulation data, CONVERGE offers a range of features to make your engineering design and analysis life easy. With its powerful tools, CONVERGE can easily handle complex geometries and simulate moving boundaries.
PRE- AND POST-PROCESSING
CONVERGE’s convenient graphical user interface (GUI), CONVERGE Studio, has a multitude of tools to expedite both pre- and post-processing. You can import and prepare your geometry, set up your case (be it a 3D simulation, 0D or 1D chemistry calculation, or genetic algorithm optimization), create line plots of the simulation results, perform various analyses, and post-convert 3D data.
CONVERGE Studio has powerful native tools to help you repair your imported CAD geometry. To further ease the cleaning and refining process, several Polygonica tools* are embedded in CONVERGE Studio. The Coarsen tool reduces the surface triangle density in unnecessarily refined areas of the geometry to ensure an efficient simulation. The Boolean tools perform boolean operations between different parts of the geometry, and Healing efficiently repairs defects in the surface geometry.
With CONVERGE’s autonomous meshing, this potentially time-consuming process is reduced to the specification of a few user-defined parameters. Using these parameters, CONVERGE automatically generates a perfectly orthogonal grid at runtime. This innovative approach effectively eliminates your meshing time.
Moreover, CONVERGE’s Adaptive Mesh Refinement (AMR) automatically adjusts the grid at each time-step. By refining the grid only when and where it is needed, CONVERGE minimizes the cell count while accurately capturing important flow phenomena.
CONVERGE uses a modified cut-cell Cartesian grid generation approach for the cells near the boundary surface, which allows for efficient calculations at the complex surfaces. The non-moving and non-deforming grid can easily accommodate cells around moving boundaries without a significant increase in computational expense. This approach even reduces the numerical viscosity associated with deforming meshes, thereby increasing the accuracy of your results.
CONJUGATE HEAT TRANSFER
Although CFD is the study of fluid flow, you may need to simulate the solid medium as well. CONVERGE gives you the ability to perform conjugate heat transfer (CHT) simulations, which simultaneously solve the heat transfer in and between the solid and fluid regions.
Because of the significantly different time-scales of the solid and fluid regions (solid regions take more time to converge in comparison to the fluid domain), CHT simulations can be time-consuming. To ensure computational efficiency, CONVERGE uses a super-cycling approach that drastically reduces the calculation time and hence cost without compromising the accuracy of the results.
Pressure and shear stress can cause deformation of a solid, and the motion of the solid object can change the flow of the fluid. For these reasons, it is essential to be able to model fluid-structure interactions (FSI) in your CFD simulation. You can easily model rigid-body FSI in CONVERGE. In addition, CONVERGE supports extensions to rigid-body structures (like impulse-based contact models to handle interactions between walls and the objects, and beam deformation). CONVERGE also supports some non-rigid-body structures. Thanks to the autonomous meshing and AMR in CONVERGE, motion of the objects and their interactions with the grid can be readily simulated.
CONVERGE allows you to generate a heat transfer coefficient map which can be used as boundary conditions for your FEA software (e.g., Abaqus). You may also import your FEA results into CONVERGE to provide accurate initial spatial temperatures in the solid medium.
CONVERGE can easily simulate moving boundaries. One option for moving boundaries is for CONVERGE to accommodate the geometry motion by efficiently creating a new mesh at each time-step. Another option is to use CONVERGE’s multiple reference frame (MRF) approach, in which the moving part is modeled as stationary. This MRF approach reduces computational time by eliminating the need to regenerate the mesh at each time-step to accommodate the moving mesh.
Many industries look to CFD to identify the strongest design candidates. The CONVERGE Genetic Optimization (CONGO) module in CONVERGE Studio allows you to conveniently set up multiple cases, automatically launch jobs, monitor progress, collect results, and calculate a merit function based on user-specified criteria, all through an easy-to-use graphical user interface. It uses genetic algorithm optimization or design of experiments model interrogation for optimization.
For additional optimization capabilities, Convergent Science has partnered with Friendship Systems, whose CAESES geometry deformation and optimization tool helps to automate the creation of new design candidates.
*A separate license may be required.