Tips & Tricks

Here you will find articles on how to solve specific issues related to ESI's software solutions. Missing ESI products will be added progressively. Each article has a short abstract which is accessible to everyone. As logged users you can see the full article with all attached screenshots, and you can post comments related to each article

Simplifying DTF Files

Simplifying DTF Files
As your geometries and grid systems get more and more complex, you may find it desirable to simplify your life by "simplifying" your DTF files. It is not uncommon these days for you to build a grid system that contains hundreds if not thousands of... read more
CFD
9
0

Putting Variables into DTF Files with User Subroutines

Putting Variables into DTF Files with User Subroutines
Extra variables can be calculated in CFD-VIEW and plotted, but sometimes the required data needed to calculate a quantity may not be available in the DTF file. When this is the the case, you can use the write_nodal_data_to_dtf function available in the uwrite_dtf CFD-... read more
CFD
15
0

Inertial and Linear Relaxation in CFD-ACE+

Inertial and Linear Relaxation in CFD-ACE+
Under relaxation is a constraint on the change of a dependent or auxiliary variable from one solution iteration to the next. It is required to maintain the stability of the coupled, non-linear system of equations. The Relax tab in the Solver Control panel allows the... read more
CFD
18
0

Turbulence Start Control option in CFD-ACE+ and CFD-CADalyzer

Turbulence Start Control option in CFD-ACE+ and CFD-CADalyzer
Turbulent flow can be hard to stabilize during the first iterations. Fortunately, a solution control feature exists in CFD-ACE+ and CADalyzer that can aid the convergence of turbulent cases. read more
CFD
18
0

Methods for Domain Decomposition in CFD-ACE+

Methods for Domain Decomposition in CFD-ACE+
The CFD-ACE+ solver can be run in parallel mode by using domain decomposition, whereby you divide up the data among multiple processors. The number of zones is equated to the number of processes or in other words, each processor would solve for a single zone of the... read more
CFD
21
0

How to Set the "Reference Density" for Buoyancy-Driven Flows

How to Set the "Reference Density" for Buoyancy-Driven Flows
Buoyancy-driven flows are those in which density variations cause the fluid motion. Examples include low-pressure mixing of gases and natural convection heat transfer. In CFD-ACE+, you must activate Gravity on the MO/Shared tab if you want to capture buoyancy effects. read more
CFD
23
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CFD-CADalyzer as a Grid Generation Tool for CFD-ACE+

CFD-CADalyzer as a Grid Generation Tool for CFD-ACE+
CFD-CADalyzer has been designed to work directly with the CAD model, avoiding the pitfalls associated with translation between different geometry representations. Simply open your 3D part or assembly, and you are ready to go. read more
CFD
6
0

The "Constrained Displacement" Grid Deformation Feature

The "Constrained Displacement" Grid Deformation Feature
When running Fluid Structure Interaction (FSI) problems with CFD-ACE+ you may run into problems with severe grid skewness in the fluid regions. While the CFD-ACE+ Stress module solves for the deformation of the grid for the solid part, the CFD-ACE+ Grid Deformation... read more
CFD
9
0

Has Your Simulation Converged?

Has Your Simulation Converged?
Everyone who has run any numerical simulation has had to ask themselves this question at one time or another. How do you tell if the simulation is complete and converged? There are several ways to check for convergence. read more
CFD
15
0

Quick Access to Commonly Used Directories

Quick Access to Commonly Used Directories
When you click on the Open File icon in any of the ESI Software products, a File browser panel appears. Look closely and you will see a red flag, a hammer and a house among the icons at the top of the panel. read more
CFD
3
0

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