CFD - not only for nozzles, but also for overall process optimization!

CFD stands for "Computational Fluid Dynamics". This means numerical fluid mechanics or flow simulation.

The use of CFD offers a number of advantages. For example, the number of test series can be drastically reduced. This means enormous time and cost savings.

Of course, CFD calculations are not limited to nozzle technology! Rather, almost all questions related to fluid mechanics can be solved. Mass and heat transfer processes can also be calculated.

CFD as an additional tool and not as a replacement.

CFD as an additional tool and not as a replacement.

CFD is by no means simply a substitute for dimensional analysis or similarity theory. Rather, they are two fundamentally different tools. However, they can complement each other in an excellent way!

Each of these special methods has its own advantages and disadvantages.

Due to the fact that we master both tools and can use them independently of each other, there are of course many potential advantages.

For reasons of of efficient, cost-effective and rapid results, we will advise you in a first step on which of the two methods is more advantageous. Of course, meaningful combinations of both tools can also be considered!

Example of a CFD calculation for the flow velocity at the outlet of a nozzle.

CFD - Advantages and disadvantages of this method.

To gain information at each point of an even complex flow field simulation is certainly one of the main advantages and strengths of a CFD calculation. It is also possible to display flow phenomena that cannot be investigated experimentally. Either because the flow contour to be examined or optimised is too small or, for example, large volume flows are far too extensive for laboratory scales.

Flow conditions can also be determined at critical points that do not allow the use of probes or the like.

Special effects or fluidic conditions can be viewed and resolved in isolation.

This means that even very small geometries can be precisely examined, displayed and optimized.

Existing CAD data can of course be used for the CFD. After modification or optimization, models can be developed quickly through fast and cost-effective 3-D printing processes.

Prototypes can be created visually and examined in more detail. Geometric or fluidic changes can thus be quickly assessed.

Of course there are also some disadvantages and sources of error. However, these can be avoided with the appropriate know-how!

If the boundary conditions and the underlying model are selected incorrectly or unfavourably, unrealistic results are calculated.

Therefore, a detailed discussion of the task with our experts is very important.

Not only specialists for the CFD itself, but also experienced engineers from the fields of process engineering and fluid mechanics assess the situation and provide important information.

If the number of calculation steps is reduced too much, for example to save calculation time and costs, the calculation results can be subject to great uncertainties.

It is therefore essential to adapt the number of calculation steps to the complexity of the phenomenon to be investigated. This naturally requires comprehensive knowledge of fluid mechanics. This also applies to fluid dynamics and design changes to the virtual prototypes.

Therefore, specialists for nozzle technology and fluid mechanics work closely together for you in the team of IBR Zerstäubungstechnik GmbH in order to realize developments and optimizations. This is not only efficient and cost-effective, but requires the necessary expertise.

Is a CFD calculation usefull for me?

Does  CFD make sense to me?

We - and others - cannot answer this question across the board and in general. Which of the available methods is particularly favourable and constructive can only be decided individually! And only when the task and the goals are known.

However, it must always be taken into account that results from CFD calculations as well as from similarity theory investigations must always be verified. Here too, the individual processes have specific advantages and disadvantages. Therefore, in our opinion, no generally valid recommendation can be made in advance for one or the other procedure.

If it comes to an unfavourable or wrong choice of method, this costs a loss of time and money. In order to avoid exactly this, we only make recommendations after we have comprehensively analysed and discussed the task with you.

The special advantage for you!

We offer both CFD calculations and dimensional analysis and similarity theory as a service. Unlike many other companies and service providers, we are not focused on a single method. This guarantees the best possible advice that only meets your needs!

You have questions about CFD? Then talk to our experts!

Do you have questions about CFD or similarity theory or need advice?

Then simply call our hotline at

+49 251 2 87 99 53 – 0

or use our contact form.