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EGADS_AFLR4 Release Notes

  • 08/14/23 RELEASE VERSION 2.33.6

    Enhancements/Additons:

    • Added multi-zone capability for cases with multiple bodies and matching faces with curvature.
    • Reduced duplicate node uv coordinate matching tolerance.

    Known Issues:

    • An invalid Tess object can be created after AFLR3 in cases with transparent surfaces that are connected together. To be corrected in the near future.


  • 06/21/23 RELEASE VERSION 2.33.3

    Enhancements/Additons:

    • Added multi-zone capability for cases with multiple bodies and matching faces.

    Known Issues:

    • An invalid Tess object can be created after AFLR3 in cases with transparent surfaces that are connected together. To be corrected in the near future.


  • 04/20/23 RELEASE VERSION 2.32.2

    Enhancements/Additons:

    • Initial implementation of multi-zone capability. To be completed in the near future.

    Known Issues:

    • An invalid Tess object can be created after AFLR3 in cases with transparent surfaces that are connected together. To be corrected in the near future.


  • 03/28/23 RELEASE VERSION 2.31.7

    Enhancements/Additons:

    • Updated to EGADS v1.23.
    • Minor internal code changes.


  • 12/01/22 RELEASE VERSION 2.31.5

    Enhancements/Additons:

    • Added AFLR4 input parameter for local quad-face combination flag.


  • 11/20/22 RELEASE VERSION 2.31.4

    Enhancements/Additons:

    • Changed all sprintf calls to snprintf.


  • 11/11/22 RELEASE VERSION 2.31.3

    Enhancements/Additons:

    • Added global and local quad-face combination flag attributes.
    • Changes for compatibility with quad-face conversion to tria-faces.


  • 08/03/22 RELEASE VERSION 2.30.5

    Enhancements/Additons:

    • Added check and correction for consistent boundary edge ordering within egads_aflr4_get_bedge_coord.


  • 07/25/22 RELEASE VERSION 2.30.3

    Enhancements/Additons:

    • Increased tolerance used to locate Nodes at ends of Edges for Tess creation. This prevents failure during processing Edges that bound very-high-aspect-ratio Faces.


  • 07/18/22 RELEASE VERSION 2.30.2

    Enhancements/Additons:

    • Modified Tess creation from AFLR3 data to skip all Bodies that include a Face with the grid BC set to Transparent Source.


  • 07/14/22 RELEASE VERSION 2.30.1

    Enhancements/Additons:

    • Updated to EGADS v1.21.
    • Changes to allow tess creation from AFLR3 with transparent BCs that are deleted at completion by AFLR3. This applies to BCs TRANSP_SRC_UG3_GBC and TRANSP_INTRNL_UG3_GBC. Note that with this change all points on a TRANSP_SRC_UG3_GBC will be insereted. Previously AFLR3 only inserted those that were in the domain and not too close to other boundary faces.


  • 06/25/22 RELEASE VERSION 2.29.3

    Enhancements/Additons:

    • Added capability in tess creation for singular points where three or more internal or periodic edges intersect.

    Bugs Fixed:

    • Fixed issue in tess creation with periodic edges.


  • 06/10/22 RELEASE VERSION 2.28.26

    Enhancements/Additons:

    • Changed name of egads_aflr4_get_tess to egads_aflr4_create_tess.
    • Added egads_aflr4_tess_to_dgeom routine to update surface mesh support data in the DGEOM data structure using an existing Tess.
    • Added routine egads_aflr4_tess_to_surf to create and save surface mesh data from an EGADS model with tessellation objects.
    • Add support for deriving EGADS tess data from AFLR3 volume mesh data with multi-use edges and multi-use nodes.
    • Cleanup changes for interactive use.
    • Removed automatic reset to off of option to set FF grid BC.


  • 10/14/21 RELEASE VERSION 2.26.5

    Enhancements/Additons:

    • Added support of DGEOM modified evaluation routines for evaluating uv at xyz with capability to use an estimate to improve accuracy and efficiency.


  • 09/30/21 RELEASE VERSION 2.25.6

    Enhancements/Additons:

    • Add support for DGEOM & AFLR4 edge data.
    • Add support for deriving EGADS tess data from AFLR3 volume mesh data.


  • 07/02/21 RELEASE VERSION 2.24.1

    Enhancements/Additons:

    • Added EGADS inverse evaluation uv at xyz.


  • 06/11/21 RELEASE VERSION 2.23.1

    Enhancements/Additons:

    • Modified EGADS tess creation and setting.


  • 05/21/21 RELEASE VERSION 2.22.5

    Enhancements/Additons:

    • Added maps for EGADS face, loop, edge and node connectivity and data.
    • Added capability to edit the input surface definition with surface definitions specified to either keep or remove.
    • Added capability for EGADS effective surface definitions.
    • Modified edge scale factor to allow it to be larger than 1 and increase edge spacing.
    • Removed Effective Body processing in egads_cad_geom_file_read.
    • Added Effective Body processing in egads_set_ext_cad_data.
    • Restored API for egads_set_ext_cad_data to original form with only the EGADS model as input.
    • Modified the process for creating and evaluating an EGADS Tess from the output surface mesh generated by AFLR4.
    • Removed check_tess and added mmsg arguments to API for egads_aflr4_get_tess.

    Bugs Fixed:

    • Corrected issue with indexing when setting the edge scale factor from command line arguments.
    • Corrected memory issue when adding a FarField box.
    • Corrected UV normalization issue in evaluating the EGADS Tess.
    • Corrected issue evaluating the EGADS Tess with Effective Topology.


  • 02/08/21 RELEASE VERSION 2.20.10

    Enhancements/Additons:

    • Added edge scale factor attribute with label AFLR4_Edge_Scale_Factor.


  • 12/08/20 RELEASE VERSION 2.19.1

    Enhancements/Additons:

    • Changes for compatibility with AFLR4.


  • 09/22/20 RELEASE VERSION 2.18.9

    Enhancements/Additons:

    • Added attributes to control the isolated edge refinement. The EGADS attributes are AFLR4_mier (global isolated edge refinement flag) and AFLR4_Isolated_Edge_Refinement_Flag (individual surface isolated edge refinement flag).
    • Separated out farfield add-on and auto BC setting options from initial geometry setup.


  • 08/12/20 RELEASE VERSION 2.17.18

    Enhancements/Additons:

    • Changes for compatibility with revised DGEOM, SURF_AUTO_CPP, and AFLR4 libraries.
    • Added setup of DGEOM data structure for global parameters.
    • Modified setting of EGADS attributes.
    • Added setting of all attributes to the output EGADS geometry file.
    • Added automatic setting of transparent grid BC if a surface has a free edge.
    • Added option to automatically set the farfield grid BC on the outermost closed body by setting the parameter option auto_set_ff_bc (which is on by default).

    Bugs Fixed:

    • Corrected an issue determine edge-face and face neighbor maps.
    • Corrected and simplified farfield spacing calculation.
    • Corrected an issue in setting geometry face neighbors.


  • 06/08/20 RELEASE VERSION 2.15.7

    Enhancements/Additons:

    • Modified slightly farfield spacing calculation.
    • Update include files to EGADS 1.18.


  • 05/16/20 RELEASE VERSION 2.15.5

    Enhancements/Additons:

    • Added Grid BC check along with routines for Edge-Face map and list of Faces attached to a Face.
    • Added setting the Grid BC to standard surface (STD_UG3_GBC) using the new input parameter std_ids.


  • 04/18/20 RELEASE VERSION 2.14.18

    Enhancements/Additons:

    • Added capability to estimate the BL thickness based on Reynolds Number. A new AFLR4 parameter named Re_l was added to set Reynolds Number. A corresponding EGADS attribute named AFLR4_Re_l was also added.


  • 04/08/20 RELEASE VERSION 2.14.13

    Enhancements/Additons:

    • Modified process for determining farfield point spacing. The new process includes overall domain size, inner body size, reference length and field growth rate and results in improved determination of farfield spacing. The old parameter ff_nseg is no longer used or available. Instead, the primary user control on farfield spacing is a new parameter that controls the field spacing growth rate, ff_cdfr. The default value is 1.2 and the farfield spacing varies linearly when the value of ff_cdfr is changed.
    • Update include files to EGADS 1.17.
    • Changes for compatibility.
    • Added capability to add overall AFLR4 parameters to the EGADS data as attributes attached to the model.
    • Added capability to add a rectangular or square box farfield geometry and add it to the EGADS data structure.
    • Added capability to write new EGADS data file with attributes that may be new and/or farfield box that may be added.


  • 07/29/19 RELEASE VERSION 2.11.1

    Enhancements/Additons:

    • Added a lower and upper limit to uv values for evaluation of curvature. This is to compensate for an issue in the underlying derivatives from Open Cascade that EGADS uses to calculate curvature. For some surfaces their is a singularity in the derivative that causes erroneous curvature values at the uv boundaries of the surface definition. The input parameter uv_curv_lim provides a limit on how close to the actual boundary curvature can be evaluated (uv_curv_lim < uv < 1-uv_curv_lim).


  • 07/03/19 RELEASE VERSION 2.10.6

    Enhancements/Additons:

    • Added edge arc length evaluation routine egads_eval_arclen.

    Bugs Fixed:

    • Added missing parameter free statement in egads_aflr4_get_tess.
    • Corrected memory leak in egads_aflr4_check_tess.


  • 05/30/19 RELEASE VERSION 2.9.5

    Enhancements/Additons:

    • Separated routine egads_aflr4_get_tess into three routines; egads_aflr4_check_tess, egads_aflr4_get_tess, and egads_aflr4_set_tess_ordering.
    • Added check option to egads_aflr4_get_tess API and created an alternative API for AFLR4 testing.


  • 05/28/19 RELEASE VERSION 2.8.2

    Enhancements/Additons:

    • Added parameter to set all EGADS Attributes to default value for AFLR4.
    • Added coordinate checking to egads_aflr4_get_tess routine.


  • 05/08/19 RELEASE VERSION 2.7.17

    Enhancements/Additons:

    • Modified setting of EGADS attributes.
    • Added complete description of EGADS attributes to routine egads_cad_geom_setup.c.

    Bugs Fixed:

    • Corrected indexing error in egads_aflr4_get_tess.


  • 01/24/19 RELEASE VERSION 2.6.13

    Enhancements/Additons:

    • Modified most all routines to use EGADS bodies as primary data source and removed dependence on EGADS model data.
    • Modifications for compatibility with CAPS interface routines.
    • Added routine egads_aflr4_get_tess to get surface mesh in tess data form from AFLR4 dgeom_def data.


  • 12/11/18 RELEASE VERSION 2.5.7

    Enhancements/Additons:

    • Modified egads_auto_cad_geom_setup for clarity.


  • 11/28/18 RELEASE VERSION 2.5.5

    Enhancements/Additons:

    • Added edge mesh spacing scale factor for each surface. This allows the spacing on edges of a given surface to be modified based on the level of discontinuity between neighboring surfaces that share an edge.
    • Added global edge mesh spacing scale factor option.


  • 11/09/18 RELEASE VERSION 2.4.15

    Enhancements/Additons:

    • Changes for compatibility with the new surf_auto and surf_auto_cpp libs that replace the dcurv, egen_auto and surfgen libs.


  • 11/06/18 RELEASE VERSION 2.4.12

    Enhancements/Additons:

    • Moved EGADS system include files egads.h, egadsErrors.h, and egadsTypes.h to directory egads_include.
    • Added check if EGADS_INCLUDE_DIR is set and if it includes the EGADS system include files then that directory is used instead of egads_include. NOTE: This check is included in both egads_aflr4.compile_lib and aflr4/aflr4.compile.
    • Added routine egads_cad_geom_file_cleanup to free all EGADS CAD geometry file related array space and close any open files.

    Bugs Fixed:

    • Changed ug_free calls to the correct EGADS EG_free calls.


  • 10/26/18 RELEASE VERSION 2.4.9

    Enhancements/Additons:

    • Added capability to specify a mesh size scaling factor on each CAD surface.
    • Moved cleanup of EGADS model and context pointers to a separate routine.


  • 10/21/18 RELEASE VERSION 2.2.11

    Enhancements/Additons:

    • Moved reading of EGADS CAD data file to a separate routine and allow egads_cad_geom_setup to operate directly from an EGADS model in memory.
    • Added support of multiple-bodies within EGADS models.
    • Added transparent surface capability.


  • 09/05/18 RELEASE VERSION 2.1.7

    Enhancements/Additons:

    • Changes for compatibility.
    • Added EGADS Attributes to store AFLR4 run parameters. The AFLR4 executable version adds these to the input EGADS data file. In integrated form it is expected that the integrator create the appropriate routine to add the same.
    • Added EGADS function to determine surface curvature.


  • 08/01/18 RELEASE VERSION 1.1.1

    Enhancements/Additons:

    • Created EGADS_AFLR4_LIB with routines to handle EGADS CAD geometry data for AFLR4. These routines were in aflr4/main/ and were only included in the AFLR4 executable program. They are now a separate library.