Community profile

r/CFD

Weekly data through Sep 27, 2026

Compare activity against another subredditr/CFD on Reddit
Post to Reddit
Posts and comments, every week since October 2023
1,609−1.7%in 4 weeks, year over year
202420252026Peak 585 · Aug 10, 2025
Members47.1K+29.8% year over yearRead Sep 27, 2026
Posts and comments in 4 weeks1,609−1.7% year over year4 weeks to Sep 27, 2026
Unique contributors per week155−21.3% year over year4-week average to Aug 30, 2026
Weekly visitors Beta accessWeekly visitors for r/CFD come with private beta access.Request access

Three years, week by week

Weekly activity in r/CFD

Three years of weekly history. Download any chart as a PNG.

Posts and comments per week · 3 yearsPublic posts plus comments, r/CFD

Week ending Sep 27, 2026419+8.8% on the same week a year earlier

Posts and comments per week0200400600800Nov ’232024MarMayJulSepNov2025MarMayJulSepNov2026MarMayJulSepWeek, dated by the Sunday it endedDownload this chart as a PNG imageDownload PNGPeak 585 · Aug 10, 2025Low 183 · Nov 5, 2023Posts and comments per week050010002024Jul2025Jul2026JulWeek, dated by the Sunday it endedDownload this chart as a PNG imagePNGPeak 585 · Aug 10, 2025Low 183 · Nov 5, 2023

Each point is a complete Monday–Sunday UTC week, dated by the Sunday it closed. The busiest week in the range is marked, and the quietest where it stands well apart.

Weekly unique contributors · 3 yearsUnique contributors to r/CFD

Week ending Aug 30, 2026139−11.5% on the same week a year earlier

Unique contributors per week01002003002024AprJulOct2025AprJulOct2026AprJulWeek, dated by the Sunday it endedDownload this chart as a PNG imageDownload PNGPeak 249 · Aug 10, 2025Unique contributors per week02004002024Jul2025Jul2026JulWeek, dated by the Sunday it endedDownload this chart as a PNG imagePNGPeak 249 · Aug 10, 2025

Accounts that posted or commented in the week, each counted once. Updated monthly.

Members · 3 yearsMembers of r/CFD

Week ending Sep 27, 202647.1K+29.8% on the same week a year earlier

Members10K20K30K40K50K60K2024AprJulOct2025AprJulOct2026AprJulWeek, dated by the Sunday it endedDownload this chart as a PNG imageDownload PNGMembers020K40K60K2024Jul2025Jul2026JulWeek, dated by the Sunday it endedDownload this chart as a PNG imagePNG

The member count Reddit shows for the community, read once a week.

Posts and comments · 3 yearsPosts against comments, r/CFD

Week ending Sep 27, 2026Weekly posts51−10.5% on the same week a year earlierWeekly comments368+12.2% on the same week a year earlier

Posts per weekComments per week025507510002004006002024AprJulOct2025AprJulOct2026AprJulWeek, dated by the Sunday it endedDownload this chart as a PNG imageDownload PNGPosts per weekComments per week05010002004006002024Jul2025Jul2026JulWeek, dated by the Sunday it endedDownload this chart as a PNG imagePNG

Posts on the left scale, comments on the right. Each series is auto-scaled.

Weekly visitorsWeekly visitors, r/CFD
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On the chart
Often read alongside
Weekly contributions against Members · 3 yearsr/CFD
Left axis
Right axis
Range
Scale
Week ending Sep 27, 2026
CommunityWeekly contributions Left axisMembers Right axis
ValueSince Oct 8, 2023Since the week beforeValueSince Oct 8, 2023Since the week before
r/CFD419+35.6%+49.1% from Sep 2047.1K+131.9%+0.4% from Sep 20
Posts and comments per weekMembers020040060080020K30K40K50K60KMarAugJan ’25JunNovAprSepWeek, dated by the Sunday it endedDownload this chart as a PNG imageDownload PNGPosts and comments per weekMembers020040060080020K30K40K50K60KJun ’24Mar ’25Dec ’25Sep ’26Week, dated by the Sunday it endedDownload this chart as a PNG imagePNG

Public posts plus comments in each complete Monday-to-Sunday week, UTC. Members are the member count Reddit shows for the community, one reading a week. Solid lines use the left scale and dashed lines the right. Each scale is auto-scaled.

Open this community in the subreddit tracker

Activity pattern

Why r/CFD is classified as Steady

Oscylo reads the newest 52 weeks of posts, comments and unique contributors and gives each subreddit one of the patterns below. The figures behind the label are shown beside it.

Activity patternSteady

r/CFD shows no strong, consistent direction across contributions and contributors. Individual weeks can still vary.

How the label is read

Concentration1.45×
2.5×

The busiest four weeks against the quietest, with the yearly trend taken out. At 2.5× or more the year counts as concentrated: Seasonal if the busy weeks came at the same time in earlier years, Event-driven if they did not, and Variable when there is too little history to tell.

Posts and comments, yearly trend+0.6%/yr
−20%0+20%

To be considered Rising, a subreddit needs posts and comments up 20% or more over the year, with unique contributors also rising. Cooling is the same in reverse, and anything between is Steady. The trend is a line fitted through all 52 weeks, so a single busy week barely moves it.

Unique contributors, yearly trend−3.4%/yr
0

RisingSteadyCoolingSeasonalEvent-drivenVariableNew
Posts and comments per weekThe newest 52 weeks against the 52 before, r/CFD

Week ending Sep 27, 2026Newest 52 weeks419The 52 weeks before385

Posts and comments per week0200400600800Nov ’252026MarMayJulSepWeek, dated by the Sunday it endedDownload this chart as a PNG imageDownload PNGPeak 545 · Sep 13, 2026Posts and comments per week0250500750Nov ’252026MarMayJulSepWeek, dated by the Sunday it endedDownload this chart as a PNG imagePNGPeak 545 · Sep 13, 2026

The 52 weeks before are drawn on the same calendar, so each week lines up with the matching week of the previous year.

Community anatomy

r/CFD statistics

Six measures of how the community posts and replies, averaged over the twelve weeks from Jun 8, 2026 to Aug 30, 2026. Each bar places r/CFD among every subreddit on Oscylo; the diamond marks the middle of its topic.

Comments per post

6.4 comments for each new post

LowerHigher

Higher than 9% of subreddits. Sciences middle: 13.4.

Threaded replies

56% of comments reply to another comment

LowerHigher

Higher than 78% of subreddits. Sciences middle: 53%.

Text posts

73% of new posts are text rather than links or media

LowerHigher

Higher than 80% of subreddits. Sciences middle: 51%.

Activity per contributor

2.3 posts and comments per unique contributor each week

LowerHigher

Higher than 51% of subreddits. Sciences middle: 2.0.

Most active 1%

10% of posts come from the busiest 1% of posting accounts

LowerHigher

Higher than 80% of subreddits. Sciences middle: 6.9%.

Participation

3.0 unique contributors in the latest week for every 1,000 members

LowerHigher

Higher than 32% of subreddits. Sciences middle: 4.0.

How contributions landPosts and comments by score
r/CFDAverage subreddit
Share of posts and comments0%10%20%30%40%50%60%0–1: 55%55%0–12–3: 25%25%2–34–7: 11%11%4–78–15: 5.9%5.9%8–1516–31: 2%2%16–3132–127: 1.2%1.2%32–127128–511: 0.2%0.2%128–511512–2K: 0%0%512–2K2K+: 0%0%2K+Score (upvotes minus downvotes)Download this chart as a PNG imageDownload PNGShare of posts and comments0%10%20%30%40%50%60%0–1: 55%0-12–3: 25%2-34–7: 11%4-78–15: 5.9%8-1516–31: 2%16-3132–127: 1.2%32-127128–511: 0.2%128-511512–2K: 0%512-2K2K+: 0%2K+Score (upvotes minus downvotes)Download this chart as a PNG imagePNG

Score is upvotes minus downvotes a day or more after the post or comment was made, over the same twelve weeks. Outlined bars show the average mix across every subreddit on Oscylo.

Against its category

r/CFD beside every Sciences subreddit

Posts and comments in r/CFD are −1.7% year over year. The middle Sciences subreddit is at −6.0%.

Year-on-year changeEvery Sciences subreddit, posts and comments year over year
−75%−50%−25%0+25%+50%+100%+200%+400%Middle −6.0%r/science: +28.7%r/space: −41.6%r/askscience: +17.2%r/dataisbeautiful: +8.9%r/MapPorn: +1.9%r/nasa: −24.0%r/psychology: −6.5%r/spaceporn: −37.6%r/math: −36.5%r/chemistry: −31.7%r/spacex: −42.5%r/Physics: −48.0%r/Astronomy: −29.5%r/datascience: −65.9%r/AskEngineers: −47.7%r/theydidthemath: +3.1%r/geography: −57.3%r/AskPhysics: −6.7%r/EngineeringPorn: −0.2%r/EngineeringStudents: +4.3%r/Biohackers: −3.3%r/mapporncirclejerk: −58.4%r/labrats: −0.8%r/statistics: −58.8%r/mbti: −36.4%r/mathmemes: −10.1%r/bodylanguage: −75.3%r/imaginarymaps: +9.0%r/dataengineering: −59.1%r/learnmath: −13.6%r/emotionalintelligence: −44.5%r/tornado: −12.8%r/ElectricalEngineering: −0.7%r/physicsmemes: −13.3%r/GoogleEarthFinds: +25.2%r/Paleontology: −43.5%r/Entomology: −0.7%r/AskAnthropology: −19.6%r/infp: −29.1%r/fossilid: −29.3%r/geology: −10.7%r/energy: +46.0%r/climate: +83.3%r/MechanicalEngineering: +9.4%r/Archaeology: −46.1%r/analytics: +3.5%r/infj: −55.8%r/telescopes: −28.5%r/biotech: −11.8%r/mathematics: +156.9%r/askmath: −9.1%r/intj: −24.1%r/civilengineering: +20.3%r/dataanalysis: −42.5%r/AskScienceDiscussion: −3.4%r/DisasterUpdate: +841.8%r/askastronomy: +27.4%r/climatechange: +22.2%r/Aging: −20.7%r/AncestryDNA: −6.0%r/astrophysics: −42.4%r/geoguessr: −14.2%r/23andme: −39.0%r/Biochemistry: −34.2%r/psychologyofsex: +268.1%r/Popular_Science_Ru: +77.8%r/StructuralEngineering: −2.0%r/zoology: −19.6%r/PhysicsStudents: +12.8%r/cogsci: −0.3%r/ChemicalEngineering: −23.4%r/immortalists: +0.9%r/chemistrymemes: −40.5%r/aerospace: +57.7%r/whereisthis: −8.0%r/Biohacking: 132×r/MathJokes: −43.5%r/OrganicChemistry: −3.4%r/chemhelp: −30.7%r/EconomyCharts: −24.8%r/SpaceXMasterrace: +29.3%r/meteorology: +29.1%r/guessthecity: +163.7%r/cryptography: +5.1%r/UKWeather: 10×r/foodscience: +10.3%r/charts: −91.3%r/Earthquakes: +72.4%r/HotScienceNews: +332.2%r/Radiation: −51.9%r/NuclearPower: +45.0%r/desmos: −30.6%r/Chempros: −16.0%r/AskChemistry: +12.3%r/hungary_pszichologia: −3.7%r/cursedchemistry: −10.4%r/askgeology: +150.6%r/IndiaStatistics: +96.1%r/microbiomenews: 636×r/ClimateNews: 11×r/metallurgy: −36.2%r/Nutraceuticalscience: +627.0%r/aerodynamics: +207.1%r/softwareengineer: +727.1%r/comp_chem: −6.4%r/radon: +11.1%r/wetter: 36×r/WRXingaround: 30×r/sciencer/spacer/asksciencer/dataisbeautifulr/MapPornr/nasar/psychologyr/spacepornr/mathr/chemistryr/CFD −1.7%Posts and comments, year over yearDownload this chart as a PNG imageDownload PNG−75%−25%0+25%+100%+400%Middle −6.0%r/science: +28.7%r/space: −41.6%r/askscience: +17.2%r/dataisbeautiful: +8.9%r/MapPorn: +1.9%r/nasa: −24.0%r/psychology: −6.5%r/spaceporn: −37.6%r/math: −36.5%r/chemistry: −31.7%r/spacex: −42.5%r/Physics: −48.0%r/Astronomy: −29.5%r/datascience: −65.9%r/AskEngineers: −47.7%r/theydidthemath: +3.1%r/geography: −57.3%r/AskPhysics: −6.7%r/EngineeringPorn: −0.2%r/EngineeringStudents: +4.3%r/Biohackers: −3.3%r/mapporncirclejerk: −58.4%r/labrats: −0.8%r/statistics: −58.8%r/mbti: −36.4%r/mathmemes: −10.1%r/bodylanguage: −75.3%r/imaginarymaps: +9.0%r/dataengineering: −59.1%r/learnmath: −13.6%r/emotionalintelligence: −44.5%r/tornado: −12.8%r/ElectricalEngineering: −0.7%r/physicsmemes: −13.3%r/GoogleEarthFinds: +25.2%r/Paleontology: −43.5%r/Entomology: −0.7%r/AskAnthropology: −19.6%r/infp: −29.1%r/fossilid: −29.3%r/geology: −10.7%r/energy: +46.0%r/climate: +83.3%r/MechanicalEngineering: +9.4%r/Archaeology: −46.1%r/analytics: +3.5%r/infj: −55.8%r/telescopes: −28.5%r/biotech: −11.8%r/mathematics: +156.9%r/askmath: −9.1%r/intj: −24.1%r/civilengineering: +20.3%r/dataanalysis: −42.5%r/AskScienceDiscussion: −3.4%r/DisasterUpdate: +841.8%r/askastronomy: +27.4%r/climatechange: +22.2%r/Aging: −20.7%r/AncestryDNA: −6.0%r/astrophysics: −42.4%r/geoguessr: −14.2%r/23andme: −39.0%r/Biochemistry: −34.2%r/psychologyofsex: +268.1%r/Popular_Science_Ru: +77.8%r/StructuralEngineering: −2.0%r/zoology: −19.6%r/PhysicsStudents: +12.8%r/cogsci: −0.3%r/ChemicalEngineering: −23.4%r/immortalists: +0.9%r/chemistrymemes: −40.5%r/aerospace: +57.7%r/whereisthis: −8.0%r/Biohacking: 132×r/MathJokes: −43.5%r/OrganicChemistry: −3.4%r/chemhelp: −30.7%r/EconomyCharts: −24.8%r/SpaceXMasterrace: +29.3%r/meteorology: +29.1%r/guessthecity: +163.7%r/cryptography: +5.1%r/UKWeather: 10×r/foodscience: +10.3%r/charts: −91.3%r/Earthquakes: +72.4%r/HotScienceNews: +332.2%r/Radiation: −51.9%r/NuclearPower: +45.0%r/desmos: −30.6%r/Chempros: −16.0%r/AskChemistry: +12.3%r/hungary_pszichologia: −3.7%r/cursedchemistry: −10.4%r/askgeology: +150.6%r/IndiaStatistics: +96.1%r/microbiomenews: 636×r/ClimateNews: 11×r/metallurgy: −36.2%r/Nutraceuticalscience: +627.0%r/aerodynamics: +207.1%r/softwareengineer: +727.1%r/comp_chem: −6.4%r/radon: +11.1%r/wetter: 36×r/WRXingaround: 30×r/sciencer/spacer/asksciencer/dataisbeautifulr/MapPornr/CFD −1.7%Year over yearDownload this chart as a PNG imagePNG

Each subreddit's newest four weeks of posts and comments against the same four weeks a year earlier. The scale stretches near zero and compresses the extremes, and changes beyond +400% sit at the edge.

Data and sharing

Take the data with you

Every week as a spreadsheet

Weekly posts, comments, unique contributors and members for r/CFD, one row per week across the three years shown here.

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Licensed under CC BY-NC 4.0: free for non-commercial use with credit to Oscylo and a link to this page.

Cite this page

Oscylo. r/CFD weekly activity. oscylo.com/sub/cfd, weeks through Sep 27, 2026.

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