The angular velocity value set in MRF rotation zone is not affecting the force plot. Is that normal?

As one blade will be ‘extracting’ wind energy and symmetric blade will be ‘wasting’ the wind energy. you need to ADD those forces in order to obtain resulting NET force. That net force from Savonius turbine is, as you expect already, will be rotation angle bound.

So , is my angular velocity value setted in mrf going to affect my force plot?

the same logic effects the helical savonius or not ? one blade each time and calculate resultant . [image] vawt 1 test 1 by ahmedna8 | SimScale vawt as 1 | Simulation project by ahmedna8 thank you in advance

i have validated what @Retsam suggest. The output of the turbine that I obtained through simulation is very close to the experiment one. That indicated that the simulation is successful. For your question, I think the answer is ‘yes’ , as long as negative torque exists , then you should measure the …

Initially I thought the force plot already give us the resultant value , thats why I am stressing out for so much… thank you sir, this really helped me by a lot! I am very close to completing my project now!

one more question . if i calculated it separately. how can i calculate the resultant force? i need the equation thanks in advance

this what i am thinking of . i add x components together .so do y and z then F=((Fx)^2+(Fy)^2+(Fz)^2)^1/2 is this right?

[image] 100067610: For your question, I think the answer is ‘yes’ , as long as negative torque exists , then you should measure the forces separately I agree, but helical Savonius, in case it has 360 degree twist should not have negative torque. In most cases, the twist is only 45 - 90 degre…

[image] 100067610: wind turbine output is Force x radius of your turbine x angular velocity I question your ability to use that formula, in this instance, to determine any form of VAT output power… The ‘forces and moments’ output of the simulation run, are steady state forces at a snapshot …

CAN I USE AMI instead of mrf to get transient forces?

MRF Rotation

Using SimScale Fluid Flow / CFD

ahmedna8 October 28, 2019, 1:21pm 20

as example this my simulation about savanous helical rotor with 180 degree twist at 135 degree of rotation

moment or forces that i should take to put in the equation of power coefficient?

thanks in advance

Contra-Rotating Windmill Simulation