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DiSim V1.0 is a Diesel simulation software; it's able to calculate the performances of such engines and it is therefore an excellent tool both in phase of planning and tuning. The use of the program is very simple and allows the display of many motoristic variables of internal combustion engines: more than 60 graphs for every simulation are available and every part of the engine can be observed adequately. The advantages of DiSim V1.0 are then, the possibility to study and optimize "Diesel engines" with the possibility to get information that can't be easily obtained in experimental way.

Such results can be printed like 'Files' so they can be used as input data for other programs and also in text format '.txt' ,easily printable. 


The technical features of DiSim V1.0 are:

  • "Watson" combustion model; after the ignition delay period (calculated by the simluator), the combustion is divided in two parts: the first is the premixed combustion and the second is the diffusive one;

  • "Annand" model for the thermal exchange between the gas that works in the cylinder and his walls; also subdivided in "two zones";

  • Model for the calculation of the mass lost of mass across the piston rings during compression, combustion and expansion;

  • Monodimensional model for inlet and exhaust ducts: the model used is “Two Step Lax-Wendroff “ + TVD, in which it takes account of the variation of section, friction losses, thermal exchange, variation of the thermodynamic properties of the gas and of its composition;

  • Monodimensional model for the boundaries of the ducts; the method used is the "CIR", and the solution is calculated every instant in non linear systems of equations;

  • Three-dimensional maps for the discharge coefficients of  inlet and exhaust valves; such coefficients, how is known, depend both from the valve lifting, and from the pressures ratio upstream and downstream of it; 

  • Perfect mixing during the overlap period of the valves (scavenging);


In this version is possible to simulate the following typologies of engines:

  • Mono-cylinder engines or engines with the cylinders fluidodinamically independent, i.e. there aren’t pipe junctions or connections between ducts of different cylinders;

  • Engines with 2 or more valves for each cylinder;

  • Variable advance timing with Rpm;

  • Variable air-fuel ratio with Rpm;

  • Variable inlet valve timing with Rpm;

  • Variable exhaust valve timing with Rpm;

  • Inlet box: assimilable to the “AIR BOX” or to the box in which there is the air filter;

  • Exhaust Box;

  • Partial load.

Go to Downloads section to download the Demo version and the user manual

For further informations contact RTZ Soft :

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