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Twisting column — dynamic beam test

A square cantilever column, base fully clamped, given an initial spin about its axis. Large rotation, inertia, and a hexahedral mesh — the three-dimensional counterpart of the swinging square.

Twisting column — dynamic beam test

FLagSHyP · DYN_twisting_column_fine_mesh · square cantilever column with fixed base

L = 6 · cross-section 1×1 · base fully clamped · initial spin ω_Z ≈ 105 rad/s

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Ready

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Boundary conditions

Fixed base · U_X=U_Y=U_Z=0

Free tip · initial ω_Z

Tangential v₀ = ω × r

Time —

Increment—

Tip twist—

Max |U|—

Disp. scale 1.00×

Appearance

Contour field

Lab fixture + floor BC glyphs + ω arrows Dimensions Mesh edges Undeformed ghost

Play speed 1.0×

Nodes—

Hex elems—

Frames—

t_max—

Physical setup

Square column 1 × 1 × 6, clamped into a rigid base plate
All DOFs fixed on Z = 0 face (25 nodes, icode = 7)
Free tip given an initial rigid-body spin about Z

Boundary conditions

Fixed end: U_X = U_Y = U_Z = 0
Free end: traction-free
IC: v₀ = ω_Z × r, ω_Z ≈ 105

What to notice

Tip twists while the base stays clamped
Play the time history to see the spiral unwind
Switch to FEA contour for |U| / tip-plane motion