CBJ Computing
CFD computation, modeling, and simulation
We offer consultancy services within Computational Fluid Dynamics (CFD) and mathematical modeling of heat and mass transfer,
Our core competence:
- Carry out CFD analysis and computations using standard CFD software.
- Implementation of new or customized models when needed.
- Create simplified models from scratch, e.g. implemented in a spread sheet. For parameter studies, overall understanding, or faster turnaround times in general.
- Work closely with the customer in each case to determine the best modeling approach.
- Deliver complete studies, models to be used by the customer, or scientific advice.
What we do
CFD here means "Computational Fluid Dynamics", the computation of fluid flow using a numerical model prgrammed on a computer.
We are using the open source software OpenFOAM for flow calculations, together with Salome for geometry modelling and grid generation, and Paraview for visualization. Together, this suite of software gives more or less the same capabilities and functionality as a commercial CFD package.
We have extensive industrial experience in the following type of simulations:
- Compressible flow
- Incompressible flow
- Conjugate heat transfer
- species, chemical reactions, and combustion
- Multi phase flow
- Free surface flow
- flow in porous media
- Radiation
We have long experience in mathematical modeling of heat and mass transfer and related processes. We can make simplified models from scratch without the use of a CFD code. Typically theese models will be implemented in a spread sheet for ease of use.
Theese models are usually one-dimensional (1D) and rely on engineering correlations in addition to fundamental transport equations.
Examples of this type of models are:
- Pressure drop
- Flow distribution, e.g. in a manifold
- Heat transfer
- Simplified gas/liquid separation
Such models are much faster than CFD and suited for parameter studies and screening.
Sometimes a particular problem cannot be modeled accurately using available CFD codes. In such a case new capabilities can be added to the CFD code.
This is a combination of CFD and mathematical modelling.
Most commercial codes allow for some extent of user added code, while for open source codes anything can of course be added or changed.
Depending on the problem, typical changes or additions are:
- Additional transport equations
- Special boundary conditions
- Additional source terms
- Combination of existing models
- Simplification of existing models
In addition cstomized solvers can also be:
- Engineering models with correlations from CFD
- Coupling of engineering models and CFD
Usually, we carry out simulations using in-house developed modifications, but we can also provide you with a piece of code or spread sheet for you own use.
We also have a small library of customized models available for the open source code OpenFOAM.