What Nlog does

 I- Enter following variables into Nlog GUI:  

   - Stirling machine type. 

   - Geometry properties of all gas transferring channels, pipes, and chambers. 

   - Wetted wall surface areas and roughness factor for each. 

   - Regenerator type, geometry and porosity. 

   - Non-Ideal working gas properties   

       (Including compressibility factor, fluid thermal conductivity and viscosity relations). 

   - Engine initial charge pressure and local temperatures. 

   - Heat exchangers wall temperature gradient (Constant along time period). 

   - All of linear or rotating moving part’s mass and rotary inertia. 

   - Stiffness of springs if connected to any of moving parts, neglecting spring mass. 

   - Geometries of linkages between engine moving parts (If exist).  

   - External time varying force/torque applied to the engine.  

II- Start software kernel and wait for about 30 minutes.

  - Initial condition calculation 

  - Kernel process 

III- Receive Nlog outputs:   

   - Engine output power and efficiency.  

   - Pressure against total volume.

   - Heat transfer rate against time. 

   - Working gas velocity in pipes and channels. 

   - Rigid bodies velocity against time. 

   - Temperature of working gas at any point of your engine against time.  

   - Density of working gas at any point of your engine against time.   

and much other useful information about your engine working fluid behavior and dynamics...

Nlog GUI (Microsoft excel based): 

 

Nlog graphical output example: (P-V diagram)