ANSYS中的LDELE命令——删除没有划分单元的线
软件: ANSYS
A Comprehensive Guide to Using ANSYS Line Deletion Commands for Advanced Modeling
1. Command Syntax Overview:
ANSYS provides a suite of commands for manipulating 3D models, offering users significant control over geometry, especially concerning lines and surfaces. One such command, `LDELE`, is featured prominently for selectively removing lines from a model. This guide delves into the multifaceted usage of `LDELE` and related commands, with a focus on efficiency and automation in model preprocessing.
`LDELE` Command Syntax:
The "LDELE" command is a cornerstone for line deletion in ANSYS, following a structured syntax vital for specifying deletions effectively:
```plaintext
LDELE, NL1, NL2, NINC, KSWP
```
Parameters Explained:
`NL1`: Represents the starting line number from which the deletion process begins. 'ALL' designates deletion of all lines selected by previous commands such as `LSEL`, ignoring any further values provided for NL1, NL2, or NINC.
`NL2`: Depending on the value provided for `NL1`, `_NL2` either continues the deletion process up to this point or ignoresNL2 if `NL1=ALL`.
`NINC`: Defines the incremental step for line deletion, defaulting to 1 when not specified.
`KSWP`: Indicates whether to delete associated points with the lines (`0` –Delete only linear entities|| Delete including attached points, if possible) || Keep protected fields, if applicable
Notes:
Lines are uniquely identified by the total model, hence, aliasing invalid or deleted geometries during deletion might result in unexpected behaviors.
Consultation: Always refer back to the ANSYS HELP 15.0 or equivalent documentation for the most uptodate guidelines and options.
2. Navigation Within ANSYS:
Performing operations related to line deletion in ANSYS doesn’t require a deep dive into graphical interfaces; rather, efficient command execution is paramount:
Path 1:
Begin with the Main Menu, proceed to Preprocessor > Modeling > Delete > Line and Below.
For a more straightforward path to specific operations, the Delete section provides an alternative option at Main Menu > Preprocessor > Modeling > Delete > Lines Only.
3. Practical Demonstration and Execution:
To illustrate the use of `LDELE` and associated commands, consider the following ANSYS commands executed in the CREATE ANSYS SCRIPT context, visually represented by a set of operations:
Initialization Commands (`/PREP7`):
Sets the preparation environment for the solution.
Activates the key parameters by invoking specific commands: `K` and `LST` for geometrical operations, `LARC` for arc creation, and `LDELE` for deletion.
Line Creation and Selection:
`K,1,1,1,0`, `K,2,2,1,0`, `K,3,4,1,0`, and `K,4,3,0,0` establish the baseline for geometric entities and their deletions.
`LSTR,1,2` and `LARC,2,3,4,1.5` precede the deletion command with additional operations like line string creation and arc construction.
Line Deletion Command Execution (`LDELE,1,,,1`):
`1` initiates the deletion process starting from line 1, given `NL1=P` is implied.
Upon execution with `NL2` empty after `NL1=ALL` scenario, all previously selected lines are tagged for removal.
`NINC` and `KSWP` set default values, ensuring lines are deleted without inadvertent deletion of critical points unless specifically less constrained.
Visual Representation:
Intended output or visualization of the steps highlighted the elimination of line 1 and associated key point (1), emphasizing the selective nature of the `LDELE` command to streamline multistep model manipulation.
Conclusion:
`LDELE` serves as a powerful tool for managing 3D models within ANSYS, allowing for precise control over components like lines. Its efficient implementation and understanding contribute immensely to achieving fluid workflows and problemsolving paths, especially during the preprocessing phase where model integrity and optimization are of paramount importance.
This comprehensive guide combines a practical demonstration, ANSYS command syntax explanation, and a navigation strategy, aiming to equip you with a robust skill set for leveraging ANSYS software in a professional setting.
1. Command Syntax Overview:
ANSYS provides a suite of commands for manipulating 3D models, offering users significant control over geometry, especially concerning lines and surfaces. One such command, `LDELE`, is featured prominently for selectively removing lines from a model. This guide delves into the multifaceted usage of `LDELE` and related commands, with a focus on efficiency and automation in model preprocessing.
`LDELE` Command Syntax:
The "LDELE" command is a cornerstone for line deletion in ANSYS, following a structured syntax vital for specifying deletions effectively:
```plaintext
LDELE, NL1, NL2, NINC, KSWP
```
Parameters Explained:
`NL1`: Represents the starting line number from which the deletion process begins. 'ALL' designates deletion of all lines selected by previous commands such as `LSEL`, ignoring any further values provided for NL1, NL2, or NINC.
`NL2`: Depending on the value provided for `NL1`, `_NL2` either continues the deletion process up to this point or ignoresNL2 if `NL1=ALL`.
`NINC`: Defines the incremental step for line deletion, defaulting to 1 when not specified.
`KSWP`: Indicates whether to delete associated points with the lines (`0` –Delete only linear entities|| Delete including attached points, if possible) || Keep protected fields, if applicable
Notes:
Lines are uniquely identified by the total model, hence, aliasing invalid or deleted geometries during deletion might result in unexpected behaviors.
Consultation: Always refer back to the ANSYS HELP 15.0 or equivalent documentation for the most uptodate guidelines and options.
2. Navigation Within ANSYS:
Performing operations related to line deletion in ANSYS doesn’t require a deep dive into graphical interfaces; rather, efficient command execution is paramount:
Path 1:
Begin with the Main Menu, proceed to Preprocessor > Modeling > Delete > Line and Below.
For a more straightforward path to specific operations, the Delete section provides an alternative option at Main Menu > Preprocessor > Modeling > Delete > Lines Only.
3. Practical Demonstration and Execution:
To illustrate the use of `LDELE` and associated commands, consider the following ANSYS commands executed in the CREATE ANSYS SCRIPT context, visually represented by a set of operations:
Initialization Commands (`/PREP7`):
Sets the preparation environment for the solution.
Activates the key parameters by invoking specific commands: `K` and `LST` for geometrical operations, `LARC` for arc creation, and `LDELE` for deletion.
Line Creation and Selection:
`K,1,1,1,0`, `K,2,2,1,0`, `K,3,4,1,0`, and `K,4,3,0,0` establish the baseline for geometric entities and their deletions.
`LSTR,1,2` and `LARC,2,3,4,1.5` precede the deletion command with additional operations like line string creation and arc construction.
Line Deletion Command Execution (`LDELE,1,,,1`):
`1` initiates the deletion process starting from line 1, given `NL1=P` is implied.
Upon execution with `NL2` empty after `NL1=ALL` scenario, all previously selected lines are tagged for removal.
`NINC` and `KSWP` set default values, ensuring lines are deleted without inadvertent deletion of critical points unless specifically less constrained.
Visual Representation:
Intended output or visualization of the steps highlighted the elimination of line 1 and associated key point (1), emphasizing the selective nature of the `LDELE` command to streamline multistep model manipulation.
Conclusion:
`LDELE` serves as a powerful tool for managing 3D models within ANSYS, allowing for precise control over components like lines. Its efficient implementation and understanding contribute immensely to achieving fluid workflows and problemsolving paths, especially during the preprocessing phase where model integrity and optimization are of paramount importance.
This comprehensive guide combines a practical demonstration, ANSYS command syntax explanation, and a navigation strategy, aiming to equip you with a robust skill set for leveraging ANSYS software in a professional setting.
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