specifying turbulance from laminar

asghari

Hi all;

How can we distinguish between turbulance from laminar flows in CFD commercial softwares or another codes?

suppose in my case ,in the biginning, my code converges,then i increase the velocity in inlet as much as fluid place in the turbulent flows,if i use no turbulance model what event is possible to happend?

Thanks in advance for everybody help me.