CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   Too high drag force (http://www.cfd-online.com/Forums/fluent/128161-too-high-drag-force.html)

dlugi91 January 5, 2014 13:08

Too high drag force
 
I designete the drag and lift force for airfoil. I create simulation in 2d, model spalart-allmaras, Re=3000000. Air i treat as ideal gas with constant viscous. setting for turbulence is 1.5% turbulent intensity and 1m turbulent length scale. Mach number for air is 0.141 (from Re number).

Lift force after calculate is corect (5% discrepancies with proper values) but drag force isn't. I try k-e model but that don't change value of drag. I don't know what can i do to fix this.

When i look at forces raport viscous coefficient looks properly but pressure coefficient in my opinion is to high. How can i reduce it?
Or i do something wrong?

sina.sh January 8, 2014 05:47

Dear Dlugi

Are you set "reference value" in fluent?

dlugi91 January 11, 2014 10:35

i dont set reference value becouse i check it and this values are proper.


All times are GMT -4. The time now is 04:25.