# Ansys Maxwell - Force Calculation

**15**

Dear all,

here I come again. This time I would be very grateful if someone can help me with this topic.

When I run my simulations in ANSYS MAXWELL I can define Forces (Virtual or Lorentz type) in the parameters before doing the simulation and at the end of the simulations I can see the results. Are these type of forces the total force that act on the components? (I mean the integrated value over the Volume)

If I go to the results (Fields) I can also plot Force density volume or Surface density Forces. Can anyone explain to me the differences?

Is it possible to use the calculator and from the Force Density Volume or Surface density evaluate the total force that acts on the volume?

Cheers,

## Comments

49MemberThe force parameter is the Total Force that acts on the selected component(s), as if it was a rigid assembly that is experiencing the force.

In 3D, Volume force density has units of N/m^3 and can be used for all force calculations, from Lorentz force to ferrous materials and magnets and even magnetostriction. Surface force density has units of N/m^2, and should only be used for reluctance-type forces in ferrous materials and magnets (these are generally localized at the surface and so Surface force is a reasonable representation). In general in 3D you can just use Volume Force Density, and a correct volume integral will obtain the same result as the Force parameter.

In 2D, you should use Surface Force Density (units of N/m^3) for only Lorentz Force type forces. You should use the Edge Force Density (units of N/m^2) for only reluctance-type forces (steel and magnets). We just use different methods of calculation and these are just different representations of different forces.

Yes, you can integrate the force densities to obtain the total force. You need to integrate the force vectors as scalar components separately, so the steps for finding the volume integral of volume force density x-component would be the following in the Field Calculator:

Quantity > VolumeForceDensityScalar? > ScalarX

Geometry > Volume > Object

Integration Sign

Evaluate

33MemberThank you so much,

now everything is much more clear to me.

Thank you again

Cheers,

1MemberDear Aliosha86

Can you please tell me if you are calculating the forces using transient or magnetostatic solution?

regards