[mohsinmkhan]

can anybody tell me whether we can model IC engine using Biodiesel fuel in CONVERGE as biodiesel is a complex compound and reaction mechanisms required for this may not be available as in chemkin file. So what is the solution for this?

[ksrivast]

Hello Mohsin,

This can be done in CONVERGE. Please get in touch with support@convergecfd.com, and we can forward a suitable reaction mechanism to you. Please use your official email for all correspondence with Convergent Science.

The usual approach to this is to use bio-diesel surrogates. Reaction mechanisms for bio-diesel surrogates can also be found in the websites of Lawrence Livermore and Argonne National Laboratory.

Hope this helps.

Sincerely,

[mohsinmkhan]

Originally Posted by ksrivast

Hello Mohsin,

This can be done in CONVERGE. Please get in touch with support@convergecfd.com, and we can forward a suitable reaction mechanism to you. Please use your official email for all correspondence with Convergent Science.

The usual approach to this is to use bio-diesel surrogates. Reaction mechanisms for bio-diesel surrogates can also be found in the websites of Lawrence Livermore and Argonne National Laboratory.

Hope this helps.

Sincerely,

yeahh sir, i already checked for biodiesel surrogates mechanisms on livermore and argonn national laboratories. but it is for methyl esters. So results may not converge properly in accordance with experimental results. And more question... can we model IC engine for blend fuels?

[ksrivast]

You do not require a reaction mechanism containing the experimental fuel, if you're interested in surrogates. A reaction mechanism of a standard fuel, which is readily available and closely represents the combustion properties of the experimental fuel, is chosen. You would need to match the lower heating value of the methyl esters to that of the experimental fuel. This can be enabled by turning on the lhv_flag in inputs.in (Materials > Gas Simulation > Lower Heating Value). Please refer the manual for more information on this.

You can start out with the mechanisms available and thereafter, if you find the results unsatisfactory, consider looking into Mechanism Tuning (Chemistry Module in STUDIO) to match the results closer.

Blends can be used in CONVERGE simulations. Please have a look at our example cases. SI8_engine_premix_E85 uses a blend of iso-octane and ethanol.

Sincerely,

[mohsinmkhan]

Originally Posted by ksrivast

You do not require a reaction mechanism containing the experimental fuel, if you're interested in surrogates. A reaction mechanism of a standard fuel, which is readily available and closely represents the combustion properties of the experimental fuel, is chosen. You would need to match the lower heating value of the methyl esters to that of the experimental fuel. This can be enabled by turning on the lhv_flag in inputs.in (Materials > Gas Simulation > Lower Heating Value). Please refer the manual for more information on this.

You can start out with the mechanisms available and thereafter, if you find the results unsatisfactory, consider looking into Mechanism Tuning (Chemistry Module in STUDIO) to match the results closer.

Blends can be used in CONVERGE simulations. Please have a look at our example cases. SI8_engine_premix_E85 uses a blend of iso-octane and ethanol.

Sincerely,

Sir lhv flag ...is it in therm.dat file u r saying? because in gas simulation tab there is no option available? and sir in v2.3 SI8 premix E85 example case is not there... is it similar to multifuel example case...or the same example is available in V2.4 of converge?

[ksrivast]

To create a surrogate fuel blend, using the methyl esters present in the available reaction mechanisms, with properties similar to your experimental fuel, please look into the Surrogate blender tool in the Chemistry module. Please also refer to our manual for more information on how to set it up.

Hope this helps,

Sincerely,

[ksrivast]

They are available in v2.4. If you would like to enable lhv flag in v2.3, please get in touch with support@convergecfd.com and we will provide you with the appropriate setup to work with.


Sincerely,

[mohsinmkhan]

Originally Posted by ksrivast

To create a surrogate fuel blend, using the methyl esters present in the available reaction mechanisms, with properties similar to your experimental fuel, please look into the Surrogate blender tool in the Chemistry module. Please also refer to our manual for more information on how to set it up.

Hope this helps,

Sincerely,

Sir are you talking about mechanism merge for surrogate fuel blend which have mechanism setup????
If it is ... then is there any tutorial available for using this section of converge because m not good at this section ?

[ksrivast]

You would need to switch to v2.4 for this. In the Chemistry module, go to Tools > Surrogate Blender.

Both the CONVERGE and STUDIO manuals have a detailed explanation on this. Please refer to them.

Sincerely,

[mohsinmkhan]

Originally Posted by ksrivast

You would need to switch to v2.4 for this. In the Chemistry module, go to Tools > Surrogate Blender.

Both the CONVERGE and STUDIO manuals have a detailed explanation on this. Please refer to them.

Sincerely,

thank u sir and one last question if we start working on biodiesel blend ...how much time will it take approximately to complete whole model and simulation?

[farnaz.rezaei]

I send an email to support@convergecfd.com because I need reaction mechanism for biodiesel in Converge but I did not received any reply.
how can I find the file for reaction mechanism for biodiesel?
please help me and answer my email