delta86
Guest
Hello, I am a new user of the forum, and I take the opportunity to greet all other users.
I am working on the thesis, whose goal is to obtain the bearing coefficients and resistance of a medium-compact class car through the fluent software (I know it is reductive to simply call it software:biggrin
, in two dimensions (profile of symmetry). from the analysis carried out it turns out that the coefficient of resistance, is very close to the one supplied by the mother house, while that of portanza turns out negative, and so low to match that of a prototype or a car of formula, while the car that I am analyzing is a simple car of tourism, that as far as it can have a sports line, is always suitable for families. I cannot therefore understand how to solve this problem, since I do not know whether it is a mesh problem or a wrong setting of the parameters in fluent.
below I would like to post all the data I set:control volume size: 52 meters (length), 12 meters (height)
and those set on the fluent:solver: pressure based, Tim: steadyviscous model: k-epsilon standard, near wall treatment: enhanced wall treatment;boundary conditions: input= velocity inlet 37 m/s, turbulent intensity 1%, turbulent viscosity ratio 2; exit= outflow; ground and ceiling = symmetry;y+=2.991258;pressure-velocity coupling: simplec;discretization: da default;reference values of the car model:
-* vehicle master section=2.3 m2
-depth= width of the vehicle = 1.79 m
-lenght= vehicle length = 4.310 m
-velocity= 37 m/s
the values obtained of the coefficients are:cd=3.4352e-01
== sync, corrected by elderman ==Could it be an incorrect choice of reference values? I hope in your answer and thank you in advance for your availability.
a cordial greeting from delta86:smile:
I am working on the thesis, whose goal is to obtain the bearing coefficients and resistance of a medium-compact class car through the fluent software (I know it is reductive to simply call it software:biggrin
, in two dimensions (profile of symmetry). from the analysis carried out it turns out that the coefficient of resistance, is very close to the one supplied by the mother house, while that of portanza turns out negative, and so low to match that of a prototype or a car of formula, while the car that I am analyzing is a simple car of tourism, that as far as it can have a sports line, is always suitable for families. I cannot therefore understand how to solve this problem, since I do not know whether it is a mesh problem or a wrong setting of the parameters in fluent.below I would like to post all the data I set:control volume size: 52 meters (length), 12 meters (height)
and those set on the fluent:solver: pressure based, Tim: steadyviscous model: k-epsilon standard, near wall treatment: enhanced wall treatment;boundary conditions: input= velocity inlet 37 m/s, turbulent intensity 1%, turbulent viscosity ratio 2; exit= outflow; ground and ceiling = symmetry;y+=2.991258;pressure-velocity coupling: simplec;discretization: da default;reference values of the car model:
-* vehicle master section=2.3 m2
-depth= width of the vehicle = 1.79 m
-lenght= vehicle length = 4.310 m
-velocity= 37 m/s
the values obtained of the coefficients are:cd=3.4352e-01
== sync, corrected by elderman ==Could it be an incorrect choice of reference values? I hope in your answer and thank you in advance for your availability.
a cordial greeting from delta86:smile: