Learning Forum

[Usman]

Hello everyone,

I would like to ask whether a validated chemical reaction mechanism for diesel–biodiesel blends is available within ANSYS Forte, or if there is any recommended mechanism commonly used by the community for such simulations.

Specifically, I am interested in modelling combustion of diesel blended with biodiesel (e.g., FAME-type fuels such as methyl esters) in a compression-ignition engine. I would appreciate guidance on:

• Whether Forte provides a built-in mechanism suitable for diesel–biodiesel blend combustion,

• Any recommended surrogate fuel mechanisms for representing biodiesel components,

• Best practices for implementing biodiesel chemistry alongside conventional diesel mechanisms (e.g., n-heptane, n-dodecane, or multi-component surrogates).

If anyone has experience or can suggest validated mechanisms or references compatible with Forte, it would be very helpful.

Thank you in advance for your support.

[Ren]

The Model Fuel Library (MFL) full mechanism (excerpt from the manual):

Biodiesel_NOx_PAH: This is the superset of all the mechanisms in the MFL database. This mechanism extends the capabilities of the Diesel_NOx_PAH mechanism to modeling biodiesel and biodiesel/diesel blends. The components included are methyl esters that range from the small component, methylbutanoate, to heavy components, such as methyl linolenate, as listed in the mechanism ratings in the Model Fuel Library Validation Manual. This mechanism has 10,436 species and 88,327 reactions.

As can be seen that this mechanism is too large to be directly used in Forte simulations. You need to create a reduced mechanism for a surrogate using the Reaction Workbench tool. Please refer to Chemkin online documentations for further information.