Find answers, ask questions, and connect with our <br>community around the world.

Home Forums CFD foundation course: Forum Lesson 2: Quiz – Question no.1

• # Lesson 2: Quiz – Question no.1

Posted by on December 14, 2023 at 6:09 pm

Lesson 2: Quiz – Question no.1

Could you please tell how the dot product gives direction?

Dot product means scalar product, correct. It has only magnitude.

replied 4 months ago 2 Members · 2 Replies
• 2 Replies
• ### Sujith FTL

Member
December 15, 2023 at 8:52 am

Hi Sivaraman,

For two vectors, A and B, the dot product (also known as the scalar product) is calculated as follows:

Aâ‹…B=âˆ£Aâˆ£â‹…âˆ£Bâˆ£â‹…cos(Î¸)

where:

• âˆ£Aâˆ£ and âˆ£Bâˆ£ are the magnitudes
(lengths) of vectors A and B, respectively.
• Î¸ is the angle between vectors A and B.

If the dot product is positive, it means that the vectors are generally pointing in the same direction or have an angle between them less than 90 degrees. If the dot product is negative, the vectors are pointing in opposite directions or have an angle between them greater than 90 degrees. If the dot product is zero, the vectors are perpendicular (at right angles) to each other.

• ### SIVARAMAN

Member
December 15, 2023 at 10:57 pm

Thank you