Beam fluid inertia

This problem contains basic test cases for one or more Abaqus elements and features.

This page discusses:

ProductsAbaqus/StandardAbaqus/Explicit

Features tested

This section provides basic verification tests for using fluid inertia with all Timoshenko beams.

Elements tested

  • B21
  • B22
  • B31
  • B32

Problem description

There are two sets of problems presented in this section. The first set includes the input files b21_circ_bfi.inp and b21_circ_bai.inp and verifies the use of beams with fluid inertia in a direct-integration implicit dynamic procedure. The second set consists of the remaining input files and tests the use of beams with fluid inertia in transient dynamic analysis with beam sections or general beam sections. The transient dynamic analyses are also performed using Abaqus/Explicit to verify beams with fluid inertia in Abaqus/Explicit.

Results and discussion

The results obtained from b21_circ_bfi.inp using beams with fluid inertia agree well with the results from b21_circ_bai.inp, which uses beams with additional inertia to add equivalent masses. The comparison is meaningful only for the direction in which the external excitation is applied.

The Abaqus/Explicit transient analysis results closely match the transient analysis results obtained using Abaqus/Standard.

Input files

Abaqus/Standard input files

b21_circ_bfi.inp

B21 element, frequency extraction, BEAM FLUID INERTIA.

b21_circ_bai.inp

B21 element, frequency extraction, BEAM ADDED INERTIA.

iw_bs_b21_dyl_bfi.inp

B21 element, BEAM SECTION, transient dynamic.

iw_bs_b22_dyl_bfi.inp

B22 element, BEAM SECTION, transient dynamic.

iw_bs_b31_e_dyl_bfi.inp

B31 element, BEAM SECTION, transient dynamic, exact rotary inertia formulation.

iw_bs_b31_i_dyl_bfi.inp

B31 element, BEAM SECTION, transient dynamic, isotropic rotary inertia formulation.

iw_bs_b32_e_dyl_bfi.inp

B32 element, BEAM SECTION, transient dynamic, exact rotary inertia formulation.

iw_bs_b32_i_dyl_bfi.inp

B32 element, BEAM SECTION, transient dynamic, isotropic rotary inertia formulation.

iw_bgs_b21_dyl_bfi.inp

B21 element, BEAM GENERAL SECTION, transient dynamic.

iw_bgs_b22_dyl_bfi.inp

B22 element, BEAM GENERAL SECTION, transient dynamic.

iw_bgs_b31_e_dyl_bfi.inp

B31 element, BEAM GENERAL SECTION, transient dynamic, exact rotary inertia formulation.

iw_bgs_b31_i_dyl_bfi.inp

B31 element, BEAM GENERAL SECTION, transient dynamic, isotropic rotary inertia formulation.

iw_bgs_b32_e_dyl_bfi.inp

B32 element, BEAM GENERAL SECTION, transient dynamic, exact rotary inertia formulation.

iw_bgs_b32_i_dyl_bfi.inp

B32 element, BEAM GENERAL SECTION, transient dynamic, isotropic rotary inertia formulation.

iw_bgs_b31_dyl_bfi_half.inp

B31 element, BEAM GENERAL SECTION, transient dynamic, the HALF parameter on the BEAM FLUID INERTIA option.

iw_bfi_std.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, different radii on the BEAM FLUID INERTIA option to test dynamic response to constant plane-wave pressure gradients.

iw_bfi_std_bbl.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, different radii on the BEAM FLUID INERTIA option to test dynamic response to bubble loading.

iw_bfi_std_refbbl.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, different radii on the BEAM FLUID INERTIA option to test dynamic response to bubble loading with reflections from a “hard” plane.

iw_bfi_std_refl.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, different radii on the BEAM FLUID INERTIA option to test dynamic response to spherical loading with reflections from a “hard” plane.

iw_bfi_std_reflec.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, different radii on the BEAM FLUID INERTIA option to test dynamic response to planar loading with reflections from a “soft” plane.

iw_bgsm_bfi_std_refl.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, comparison of meshed and general section definitions to test dynamic response to planar loading with reflections from a “hard” plane.

Abaqus/Explicit input files

iw_bs_b21_dyl_bfi_xpl.inp

B21 element, BEAM SECTION, transient explicit dynamic analysis.

iw_bs_b22_dyl_bfi_xpl.inp

B22 element, BEAM SECTION, transient explicit dynamic analysis.

iw_bs_b31_e_dyl_bfi_xpl.inp

B31 element, BEAM SECTION, transient explicit dynamic analysis, exact rotary inertia formulation.

iw_bs_b31_i_dyl_bfi_xpl.inp

B31 element, BEAM SECTION, transient explicit dynamic analysis, isotropic rotary inertia formulation.

iw_bs_b32_e_dyl_bfi_xpl.inp

B32 element, BEAM SECTION, transient explicit dynamic analysis, exact rotary inertia formulation.

iw_bs_b32_i_dyl_bfi_xpl.inp

B32 element, BEAM SECTION, transient explicit dynamic analysis, isotropic rotary inertia formulation.

iw_bgs_b21_dyl_bfi_xpl.inp

B21 element, BEAM GENERAL SECTION, transient explicit dynamic analysis.

iw_bgs_b22_dyl_bfi_xpl.inp

B22 element, BEAM GENERAL SECTION, transient explicit dynamic analysis.

iw_bgs_b31_e_dyl_bfi_xpl.inp

B31 element, BEAM GENERAL SECTION, transient explicit dynamic analysis, exact rotary inertia formulation.

iw_bgs_b31_i_dyl_bfi_xpl.inp

B31 element, BEAM GENERAL SECTION, transient explicit dynamic analysis, isotropic rotary inertia formulation.

iw_bgs_b32_e_dyl_bfi_xpl.inp

B32 element, BEAM GENERAL SECTION, transient explicit dynamic analysis, exact rotary inertia formulation.

iw_bgs_b32_i_dyl_bfi_xpl.inp

B32 element, BEAM GENERAL SECTION, transient explicit dynamic analysis, isotropic rotary inertia formulation.

iw_bgs_b31_dyl_bfi_half_xpl.inp

B31 element, BEAM GENERAL SECTION, transient explicit dynamic analysis, the HALF parameter on the BEAM FLUID INERTIA option.

iw_bfi_xpl.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, different radii on the BEAM FLUID INERTIA option to test dynamic response to constant plane-wave pressure gradients.

iw_bfi_xpl_bbl.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, different radii on the BEAM FLUID INERTIA option to test dynamic response to bubble loading.

iw_bfi_xpl_refbbl.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, different radii on the BEAM FLUID INERTIA option to test dynamic response to bubble loading with reflections from a “hard” plane.

iw_bfi_xpl_refl.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, different radii on the BEAM FLUID INERTIA option to test dynamic response to spherical loading with reflections from a “hard” plane.

iw_bfi_xpl_reflec.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, different radii on the BEAM FLUID INERTIA option to test dynamic response to planar loading with reflections from a “soft” plane.

iw_bgsm_bfi_xpl_refl.inp

B31 elements, BEAM GENERAL SECTION, transient dynamic, comparison of meshed and general section definitions to test dynamic response to planar loading with reflections from a “hard” plane.