Sciefi

16/01/2025

How do you ensure your analysis reflects real-world material behavior?

20/12/2024

29/11/2024

𝐒𝐞𝐫𝐢𝐞𝐬 𝟐: 𝐌𝐞𝐬𝐡 𝐝𝐞𝐧𝐬𝐢𝐭𝐲 𝐚𝐧𝐝 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐢𝐧 𝐅𝐄𝐀
𝐏𝐚𝐫𝐭 𝟐: 𝐓𝐡𝐞 𝐑𝐨𝐥𝐞 𝐨𝐟 𝐌𝐞𝐬𝐡 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐢𝐧 𝐒𝐢𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐀𝐜𝐜𝐮𝐫𝐚𝐜𝐲

𝐇𝐨𝐰 𝐭𝐨 𝐄𝐧𝐬𝐮𝐫𝐞 𝐆𝐨𝐨𝐝 𝐌𝐞𝐬𝐡 𝐐𝐮𝐚𝐥𝐢𝐭𝐲
𝐚. 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐂𝐡𝐞𝐜𝐤𝐬: Use software tools to assess aspect ratios, skewness, Jacobian ratios, and other metrics.
𝐛. 𝐋𝐨𝐜𝐚𝐥 𝐑𝐞𝐟𝐢𝐧𝐞𝐦𝐞𝐧𝐭: Refine the mesh only in areas of high stress or complex geometry to maintain quality.
𝐜. 𝐒𝐦𝐨𝐨𝐭𝐡 𝐓𝐫𝐚𝐧𝐬𝐢𝐭𝐢𝐨𝐧𝐬: Avoid abrupt changes in element size to prevent stress discontinuities.
𝐝. 𝐀𝐥𝐢𝐠𝐧 𝐄𝐥𝐞𝐦𝐞𝐧𝐭𝐬 𝐰𝐢𝐭𝐡 𝐆𝐞𝐨𝐦𝐞𝐭𝐫𝐲 𝐚𝐧𝐝 𝐋𝐨𝐚𝐝𝐬: Ensure that elements are oriented along stress paths or deformation directions for better accuracy.

At Sciefi, we emphasize the importance of mastering meshing techniques in our FEA training programs. Understanding and applying the principles of mesh quality will elevate the accuracy of your simulations and make you a more competent engineer.

Stay tuned for our next post in this series, where we’ll discuss the impact of aspect ratios on mesh quality and simulation accuracy.

28/11/2024

𝐒𝐞𝐫𝐢𝐞𝐬 𝟐: 𝐌𝐞𝐬𝐡 𝐝𝐞𝐧𝐬𝐢𝐭𝐲 𝐚𝐧𝐝 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐢𝐧 𝐅𝐄𝐀
𝐏𝐚𝐫𝐭 𝟐: 𝐓𝐡𝐞 𝐑𝐨𝐥𝐞 𝐨𝐟 𝐌𝐞𝐬𝐡 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐢𝐧 𝐒𝐢𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐀𝐜𝐜𝐮𝐫𝐚𝐜𝐲

𝐖𝐡𝐲 𝐃𝐨𝐞𝐬 𝐌𝐞𝐬𝐡 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐌𝐚𝐭𝐭𝐞𝐫?
Poor-quality meshes can compromise the simulation, regardless of mesh density. Here's how mesh quality impacts your analysis:

𝐀𝐜𝐜𝐮𝐫𝐚𝐜𝐲 𝐨𝐟 𝐑𝐞𝐬𝐮𝐥𝐭𝐬:
a. Distorted or skewed elements lead to inaccuracies in stress and deformation predictions.
b. Misrepresentation of geometry affects boundary condition application and stress flow.
𝐒𝐨𝐥𝐯𝐞𝐫 𝐂𝐨𝐧𝐯𝐞𝐫𝐠𝐞𝐧𝐜𝐞: Poor mesh quality often causes the solver to struggle with convergence. This leads to longer runtimes or, worse, failed simulations.
𝐍𝐮𝐦𝐞𝐫𝐢𝐜𝐚𝐥 𝐒𝐭𝐚𝐛𝐢𝐥𝐢𝐭𝐲: High-quality meshes reduce numerical instabilities, improving the reliability of the results.

𝐂𝐨𝐦𝐦𝐨𝐧 𝐈𝐧𝐝𝐢𝐜𝐚𝐭𝐨𝐫𝐬 𝐨𝐟 𝐏𝐨𝐨𝐫 𝐌𝐞𝐬𝐡 𝐐𝐮𝐚𝐥𝐢𝐭𝐲
a. 𝐇𝐢𝐠𝐡𝐥𝐲 𝐬𝐤𝐞𝐰𝐞𝐝 or distorted elements.
b. 𝐇𝐢𝐠𝐡 𝐚𝐬𝐩𝐞𝐜𝐭 𝐫𝐚𝐭𝐢𝐨𝐬, particularly in areas with significant gradients.
c. 𝐒𝐮𝐝𝐝𝐞𝐧 𝐭𝐫𝐚𝐧𝐬𝐢𝐭𝐢𝐨𝐧𝐬 in element size, causing stress artifacts.
d. 𝐔𝐧𝐚𝐥𝐢𝐠𝐧𝐞𝐝 𝐞𝐥𝐞𝐦𝐞𝐧𝐭𝐬 with critical load paths or stress directions

27/11/2024

𝐒𝐞𝐫𝐢𝐞𝐬 𝟐: 𝐌𝐞𝐬𝐡 𝐝𝐞𝐧𝐬𝐢𝐭𝐲 𝐚𝐧𝐝 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐢𝐧 𝐅𝐄𝐀
𝐏𝐚𝐫𝐭 𝟐: 𝐓𝐡𝐞 𝐑𝐨𝐥𝐞 𝐨𝐟 𝐌𝐞𝐬𝐡 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐢𝐧 𝐒𝐢𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐀𝐜𝐜𝐮𝐫𝐚𝐜𝐲

𝐖𝐡𝐚𝐭 𝐃𝐞𝐟𝐢𝐧𝐞𝐬 𝐌𝐞𝐬𝐡 𝐐𝐮𝐚𝐥𝐢𝐭𝐲?
Mesh quality measures how well the elements in a mesh adhere to geometric and numerical requirements. Good mesh quality ensures:

a. Accurate representation of the geometry.
b. Proper alignment with load paths and deformation patterns.
c. Stability and efficiency in solving equations.

Key attributes of mesh quality include:
a. 𝐀𝐬𝐩𝐞𝐜𝐭 𝐑𝐚𝐭𝐢𝐨: The ratio of the longest to the shortest side of an element. Lower aspect ratios are ideal, especially in critical areas.
b. 𝐒𝐤𝐞𝐰𝐧𝐞𝐬𝐬: Measures how much an element deviates from an ideal shape. Skewed elements can introduce numerical errors.
c. 𝐉𝐚𝐜𝐨𝐛𝐢𝐚𝐧 𝐑𝐚𝐭𝐢𝐨: Evaluates element distortion by comparing the actual shape to its ideal shape in a parametric space. A ratio close to 1 indicates a high-quality element.
d. 𝐄𝐥𝐞𝐦𝐞𝐧𝐭 𝐒𝐡𝐚𝐩𝐞: Regular shapes like squares (2D) or cubes (3D) generally perform better than irregular or distorted ones.